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What is “civilization”？Civilization as a historical phenomenon speaks to certain foundational technologies，most significantly agriculture，combined with a high degree of social specialization，technological progress （albeit of a very slow kind in the case of the pre-modern world），and cultural sophistication as expressed in art，learning，and spirituality.
In turn，the study of civilization has been a traditional focus of history，as an academic discipline，since the late nineteenth century. But for practical reasons，the subject of “history”as a field of study begins with the invention of writing，something that began with the earliest civilization itself，that of the Fertile Crescent （described below）.
A human being is a member of a species of hominid，which is the same biological classification that includes the advanced apes like chimpanzees. The earliest hominid ancestor of humankind was called Australopithecus that evolved about 3. 9 million years ago. Australopithecus was similar to present-day chimpanzees，loping across the ground on all fours rather than standing upright，with a brain about one-third the size of the modern human brain. They were the first to develop tool-making technology，chipping obsidian （volcanic glass） to make knives. From Australopithecus，various other hominid species evolved，building on the genetic advantages of having a large brain and being able to craft simple tools.
One noteworthy descendant of Australopithecus was Homo erectus，which gets its name from the fact that it was the first hominid to walk upright. It also benefited from a brain three-fourths the size of the modern human equivalent. Homo erectus developed more advanced stone tool-making than had Australopithecus，and survived until about 200，000 years ago，by which time the earliest Homo sapiens—humans—had long since evolved alongside them.
Homo sapiens emerged in a form biologically identical to present-day humankind by about 300，000 years ago （fossil evidence frequently revises that number—the oldest known specimen was discovered in Morocco in 2017）. Armed with their unparalleled craniums，Homo sapiens created sophisticated bone and stone implements，including weapons and tools，and also mastered the use of fire. They were thus able to hunt and protect themselves from animals that had far better natural weapons，and （through cooking）eat meat that would have been indigestible raw. Likewise，animal skins served as clothes and shelter，allowing them to exist in climates that they could not have settled otherwise.
Homo sapiens was split between two distinct types，Neanderthals and Homo sapiens （the latter term means“the wisest man”in Greek）. Neanderthals enjoyed a long period of existence between about 400，000 and 70，000 years ago，spreading from Africa to the Middle East and Europe. They were physically larger and stronger than Homo sapiens and were able to survive in colder conditions，which was a key asset during the long ice age that began around 100，000 years ago. Homo sapiens were weaker and less able to deal with harsh conditions than Neanderthals，staying confined to Africa for thousands of years after Neanderthals had spread to other regions. A recent archeological discovery （in 2019）demonstrated that Homo sapiens reached Europe and the Near East by 210，000 years ago，but that wave of migrants subsequently vanished. As conditions warmed by about 70，000 years ago，another wave of Homo sapiens spread to the Middle East and Europe and started both interbreeding with and—probably—slowly killing off Neanderthals，who vanished soon after. By that time，Homo sapiens was already in the process of spreading all over the world.
That massive global emigration was complete by about 40，000 years ago （with the exception of the Americas，which took until about 15，000 years ago）. During an ice age，humans traveled overland on the Bering Land Bridge，a chunk of land that used to connect eastern Russia to Alaska，and arrived in the Americas. Later，very enterprising ancient humans built seagoing canoes and settled in many of the Pacific Islands.
Likewise，the absence of advanced technologies was not an impediment to the attempt to understand the world. One astonishing outgrowth of Homo sapiens ' brain power was the creation of both art and spirituality. Early Homo sapiens painted on the walls of caves，most famously in what is today southern France，and at some point they also began the practice of burying the dead in prepared grave sites，indicating that they believed that the spirit somehow survived physical death. Artifacts that have survived from prehistory clearly indicate that Homo sapiens was not only creating physical tools to prosper，but creating art and belief systems in an attempt to make sense of the world at a higher level than mere survival.
Thus，human beings have existed all over the world for many thousands of years. Human civilization，however，has not. The word civilization is tied to the Greek word for city，along with words like “civil”and “civic”.
Starting around 9500 BC，humans in a handful of regions around the world discovered agriculture，that is，the deliberate cultivation of edible plants. People discovered that certain seeds could be planted and crops could be reliably grown. Sometimes after that，people in the same regions began to domesticate animals，keeping herds of cattle，pigs，sheep，and goats in controlled conditions，defending them from predators，and eating them and using their hides. It is impossible to overstate how important these changes were. Even fairly primitive agriculture can produce fifty times more caloric energy than hunting and gathering does. With agriculture and animal domestication，it was possible for families to grow much larger and overall population levels to rise dramatically.
One of the noteworthy aspects of this transition is that hunting-gathering people actually had much more leisure time than farmers did. Thus，there were groups of people who remained hunter-gatherers despite knowing about agriculture，and it is quite possible they did that because they saw no particular advantage in adopting agriculture.
Agriculture was developed in a few different places completely independently.According to archeological evidence，agriculture did not start in one place and then spread；it started in a few distinct areas and then spread from those areas，sometimes meeting in the middle. For example，agriculture developed independently in China by 5000 BC，and of course agriculture in the Americas （starting in western South America）had nothing to do with its earlier invention in the Fertile Crescent. The most important regions for the development of Western Civilization were Mesopotamia and Egypt，because it was from those regions that the different technologies，empires，and ideas that came together in Western Civilization were forged. Thus，it is important to emphasize that the original heartland of Western Civilization was not in Greece or anywhere else in Europe；it was in the Middle East and North Africa. And things like scientific inquiry，religions （Judaism，Christianity，and Islam），engineering，and mathematics，were originally conceived in Mesopotamia and Egypt.
Early agriculture consisted of people simply planting seeds by hand or with shovels and picks. There were some important technological discoveries that took place over time that allowed much greater crop yields，however. They included：
1. Crop rotation，which people discovered sometime around 8000 BC. Crop rotation is the process of planting a different kind of crop in a field each year，then“rotating”to the next field in the next year. Every few years，a field is allowed to“lie fallow”，meaning nothing is planted and animals can graze on it. This process serves to return nutrients to the soil that would otherwise be leached out by successive years of planting，and it greatly increases yields overall.
2. The metal plow，which people invented around 5000 BC. Plows are hugely important：they opened up areas for cultivation that would be too rocky or the soil too hard to support crops normally.
3. Irrigation，which happened in an organized fashion sometime around the same time in Mesopotamia.
The early civilization of Mesopotamia consisted of fairly small farming communities. A common theory is that they may have originally came together in order to coordinate the need for irrigation systems；the Tigris and Euphrates rivers are notorious for flooding unpredictably，so it took a lot of human effort to create the dikes and canals necessary to divert floodwaters and irrigate the farmlands near the rivers. Recent archaeological evidence suggests other motives，however，including the need for protection from rival groups and access to natural resources that were concentrated in a specific area.
Of the areas in which agriculture developed，the Fertile Crescent enjoyed significant advantages. Many nutritious staple crops like wheat and barley grew naturally in the region. Several of the key animal species that were first domesticated by humans were also native to the region，including goats，sheep，and cows. The food surplus in the Fertile Crescent eventually led to the emergence of the first large settlements. Some of the earliest that were large enough to quality as towns or even small cities were Jericho in Palestine，which existed by about 8000 BC，and Çatal HÖyük in Turkey，which existed by about 7500 BC.
From their remains，it becomes possible to piece together certain facts about ancient societies on the cusp of civilization.
It is clear that the earliest settlements （already） had significant social divisions. Hunter-gatherer societies have very few social divisions；there may be chiefs and shamans，but all members of the group are roughly equal in social power. One of the traits of civilization is the increasing complexity of social divisions，and with them，of social hierarchy. In Çatal HÖyük，tombs have revealed that some people were buried with jewelry and wealth，while others were buried with practically nothing. It is very clear that even at such an ancient time，there were already major divisions between rich and poor.
That wealth was based on access to natural resources. Çatal HÖyük was built on a site that had a large deposit of obsidian （also called volcanic glass）. Obsidian could be chipped to create extremely sharp tools and weapons. Tools made from Çatal HÖyük 's obsidian have been discovered by archaeologists hundreds of miles from Çatal HÖyük itself；thus，it is clear that Çatal HÖyük was already part of long-distance trade networks，trading obsidian for other goods with other towns and villages. In essence，Çatal HÖyük 's trade in obsidian proves that specialized manufacturing （in this case，of obsidian tools）and trade networks have been around since the dawn of civilization itself.
The existence of a priesthood and organized worship used in Çatal HÖyük is striking. Priests were probably the world 's first intellectuals who used their minds for a living. Priests probably directed the efforts to build irrigation systems and made the decisions about building and rebuilding the town，especially in a period like the ancient past when natural forces—forces like floods and disease—were vastly more powerful than the ability of humans，and priests were the only people who could offer an explanation.
Not just in Mesopotamia，but all around the ancient world，there was significant evidence of religious belief systems centered on two major themes：fertility and death. One example of this was the “Venus figurines”depicting pregnant women with exaggerated physical features. Early religions hoped to ensure fertility and stave off many natural disasters that ancient people had no control over.
The earliest surviving work of literature in the world，the Mesopotamian story known as The Epic of Gilgamesh ，was obsessed with the theme of human mortality. And，as The Epic of Gilgamesh demonstrates，ancient people were well aware that no matter how great the accomplishments of a person during life，that person would inevitably die. That concern—the challenge of making sense of human existence in the face of death—is sometimes referred to “the human condition”by philosophers，and it is one that ancient people grappled with in their religious systems.
Mesopotamia，on the eastern end of the Fertile Crescent，was the cradle of Western Civilization. It has the distinction of being the very first place on earth in which the development of agriculture led to the emergence of the essential technologies of civilization. Many of the great scientific advances to follow，including mathematics，astronomy，and engineering，along with political networks and forms of organization like kingdoms，empires，and bureaucracy all originated in Mesopotamia.
Mesopotamia is a region in present-day Iraq. The word Mesopotamia is Greek，which refers to the area between the Tigris and Euphrates. It is no coincidence that it was here that civilization was born：like nearby Egypt and the Nile river，early agriculture relied on a regular supply of water in a highly fertile region. The ancient Mesopotamians had everything they needed for agriculture. With temperate climate，and the prevalence of the plant and animal species for domestication，Mesopotamia was better suited to agriculture than practically any other region on the planet.
While the Tigris and Euphrates provided abundant water，they were highly unpredictable and given to periodic flooding. Over time，the inhabitants of villages realized that they needed to work together to build larger-scale levees，canals，and dikes to protect against the floods. One theory regarding the origins of large-scale settlements is that，when enough villages got together to work on these hydrological systems，they needed some kind of leadership to direct the efforts，leading to systems of governance and administration. Thus，the earliest cities in the world may have been born not just out of agriculture，but out of the need to manage the natural resource of water.
The first settlements that straddled the line between“towns”and real “cities”existed around 4000 BC，but a truly urban society in Mesopotamia was in place closer 3000 BC，wherein a few dozen city-states managed the waters of the Tigris and Euphrates. One compelling theory about the period between the invention of agriculture and the emergence of large cities （again，between about 8000 BC and 4000 BC）is that a hybrid lifestyle of farming and gathering appears to have been very common in the large wetlands along the banks of the Tigris and Euphrates. Given the richness of dietary options in the region at the time， people lived in small communities for millennia. Somehow，however，a regime eventually emerged that imposed a new form of social organization and hierarchy，introducing taxation，large-scale building projects，and unfree labor.
The result of these new hierarchies were the first true cities emerged in the southern region of Sumer. There，the two rivers joined in a large delta that flowed into the Persian Gulf. Farther up the rivers，the northern region of Mesopotamia was known as Akkad. The division was both geographical and lingual：ancient Sumerian was not related to any modern language，but the Akkadian family of languages was Semitic，related to modern languages like Arabic and Hebrew. Urban civilization eventually flourished in both regions，starting in Sumer but quickly spreading north.
Political leaders in ancient Mesopotamia appear to have been drawn from both priesthoods and the warrior elite，with the two classes working closely together in governing the cities. Each Mesopotamian city was believed to be “owned”by a patron god，a deity that watched over it and would respond to prayers if they were properly made and accompanied by rituals and sacrifices. Meanwhile，the first kings were almost certainly war leaders who led their city-states against rival city-states and against foreign invaders. They soon ascended to positions of political power in their cities，working with the priesthood to maintain control over the common people. The Mesopotamian priesthood endorsed the idea that the gods had chosen the kings to rule，a belief that quickly bled over into the idea that the kings were at least in part divine themselves. Kings had superseded priests as the rulers by about 3000 BC. In fact，one of the earliest terms for“king”was“ensis”，meaning the representative of the god who “really”ruled the city. Thus，the typical early Mesopotamian city-state，right around 2500 BC，was a city-state engaged in long-distance trade，ruled by a king who worked closely with the city 's priesthood and who frequently made war against his neighbors.
The Mesopotamians believed that the gods were generally cruel，capricious，and easily offended. Humans had been created by the gods not to enjoy life，but to toil，and the gods would inflict pain and suffering on humans whenever they （the gods）were offended. A major element of the power of the priesthood in the Mesopotamian cities was to claim to be able to soothe and assuage the gods，to prevent the gods from sending yet another devastating flood，epidemic，or plague of locusts. It is not too far off to say that the most important duty of Mesopotamian priests was to beg the gods for mercy.
All of the Mesopotamian cities worshipped the same gods，referred to as the Mesopotamian pantheon （pantheon means“group of gods”）. Unlike the Egyptian pyramids that came later，Mesopotamian ziggurats were not tombs，but temples，and as such they were the centerpieces of the great cities.
Alongside the development of religious belief，science made major strides in Mesopotamian civilization. The Mesopotamians were the first great astronomers，accurately mapping the movement of the stars and recording them in star charts. They invented functional wagons and chariots and，as seen in the case of both ziggurats and irrigation systems，they were excellent engineers. They also invented the 360 degrees used to measure angles in geometry and they were the first to divide a system of timekeeping that used a 60-second minute. Finally，they developed a complex and accurate system of arithmetic that would go on to form the basis of mathematics as it was used and understood throughout the ancient Mediterranean world.
At the same time， however， the Mesopotamians employed “magical ”practices. The priests did not just conduct sacrifices to the gods. They practiced the art of divination：the practice of trying to predict the future. To them，magic and science were all aspects of the same pursuit，namely trying to learn about how the universe functioned so that human beings could influence it more effectively. From the perspective of the ancient Mesopotamians，there was little that distinguished religious and magical practices from“real”science in the modern sense. Their goals were the same，and the Mesopotamians actively experimented to develop both systems in tandem.
The Mesopotamians also invented the first systems of writing，first developed in order to keep track of tax records sometime around 3000 BC. Their style of writing is called cuneiform；it started out as a pictographic system in which each word or idea was represented by a symbol，but it eventually changed to include both pictographs and syllabic symbols （i. e. symbols that represent a sound instead of a word）. While it was originally used just for record-keeping，writing soon evolved into the creation of true forms of literature.
The first known author in history whose name and some of whose works survive was a Sumerian high priestess，Enheduanna. Enheduanna wrote a series of hymns to the gods that established her as the earliest poet in recorded history，praising Innana and，at one point，asking for the aid of the gods during a period of political turmoil.
Enheduanna did not record the first known work of prose. Remembered as The Epic of Gilgamesh ，the earliest surviving work of literature，it is the best known of the surviving Mesopotamian stories. The Epic describes the adventures of a partly-divine king of the city of Uruk，Gilgamesh，who is joined by his friend Enkidu as they fight monsters，build great works，and celebrate their own power and greatness. Like Enheduanna 's hymns， The Epic of Gilgamesh is a fascinating story in that it speaks to a very sophisticated and recognizable set of issues. Likewise，a central focus of the epic is Gilgamesh 's quest for immortality when he confronts the absurdity of death. Death 's seeming unfairness is a distinctly philosophical concern that demonstrates an advanced engagement with human nature and the human condition present in Mesopotamian society.
Along with literature， the other great written accomplishments of the Mesopotamians were their systems of law. The most substantial surviving law code is that of the Babylonian king Hammurabi，dating from about 1780 BC. Hammurabi 's law code went into great detail about the rights and obligations of Babylonians. It drew legal distinctions between the “free men”or aristocratic citizens，commoners，and slaves，treating the same crimes very differently. The laws speak to a deep concern with fairness—the code tried to protect people from unfair terms on loans. It provided redress for damaged property，and it even held city officials responsible for catching criminals. It also included legal protections for women in various ways.
Mesopotamia represents the earliest indications of large-scale warfare. The Mesopotamian cities always had walls—some of which were 30 feet high and 60 feet wide，essentially enormous piles of earth strengthened by brick. The evidence （based on pictures and inscriptions）suggests，however，that most soldiers were peasant conscripts with little or no armor and light weapons，and hence while cities were around for thousands of years （again，from about 3500 BC），there were no empires yet. War was instead primarily about territorial raids and perhaps noble combats meant to demonstrate strength and power. Over the course of the third millennium BC，chariots became increasingly important in warfare.
The first time that a single military leader managed to conquer and unite many of the Mesopotamian cities was in about 2340 BC，when the king Sargon the Great，also known as Sargon of Akkad （father of Enheduanna），conquered almost all of the major Mesopotamian cities and forged the world 's first true empire，in the process uniting the regions of Akkad and Sumer. His empire appears to have held together for about another century，until somewhere around 2200 BC.
Sargon himself was born an illegitimate child but he boasted about his lowly origins and claimed to protect and represent the interests of common people and merchants. Sargon appointed governors in his conquered cities，and his whole empire was designed to extract wealth from all of its cities and farmlands and pump it back to the capital of Akkad，which he built somewhere near present-day Baghdad. While his descendants did their best to hold on to power，the resentment of the subject cities eventually resulted in the empire 's collapse.
The next major Mesopotamian empire was the “Ur Ⅲ”dynasty，founded in about 2112 BC. Just as Sargon had，the king Ur-Nammu conquered and united most of the city-states of Mesopotamia. The most important historical legacy of the Ur Ⅲ dynasty was its complex system of bureaucracy，which was more effective in governing the conquered cities than Sargon 's rule had been.
Bureaucracy （which literally means“rule by office”） is one of the most underappreciated phenomena in history，probably because the concept is not particularly exciting to most people. The fact remains that there is no more efficient way yet invented to manage large groups of people：it was viable to coordinate small groups through the personal control and influence of a few individuals，but as cities grew and empires formed，it became untenable to have everything boil down to personal relationships. An efficient bureaucracy，one in which the individual people who were part of it were less important than the system itself （i. e. its rules，its records，and its chain of command），was always essential in large political units.
The Ur Ⅲ dynasty is an example of an early bureaucratic empire. Historians have more records of this dynasty than any other from this period of ancient Mesopotamia thanks to its focus on codifying its regulations. The kings of Ur Ⅲ were very adept at playing off their civic and military leaders against each other，appointing generals to direct troops in other cities and making sure that each governor 's power relied on his loyalty to the king. The administration of the Ur Ⅲ dynasty divided the empire into three distinct tax regions，and its tax bureaucracy collected wealth without alienating the conquered people as much as Sargon and his descendants had （despite its relative success，Ur Ⅲ，too，eventually collapsed，although it was due to a foreign invasion rather than an internal revolt）.
Finally，there was the great empire of Hammurabi （which lasted from 1792 BC －1595 BC），the author of the code of laws noted above. By about 1780 BC，Hammurabi conquered many of the city-states near Babylon in the heart of Mesopotamia. He was not only concerned with laws，but also with ensuring the economic prosperity of his empire；while it is impossible to know how sincere he was about it，he wanted to be remembered as a kind of benevolent dictator who looked after his subjects. The Babylonian empire recentered Mesopotamia as a whole on Babylon. It lasted until 1595 BC when it was defeated by an empire from Anatolia known as the Hittites.
What all of these ancient empires had in common beyond a common culture was that they were very precarious. Their bureaucracies were not large enough or organized enough to manage large populations easily，and rebellions were frequent. There was also the constant threat of what the surviving texts refer to as“bandits”，which in this context means the same thing as“barbarians”. To the north of Mesopotamia is the beginning of the great steppes of Central Asia，the source of limitless and almost nonstop invasions throughout ancient history. Nomads from the steppe regions were the first to domesticate horses，and for thousands of years only steppe people knew how to fight directly from horseback instead of using chariots. Thus，the rulers of the Mesopotamian city-states and empires all had to contend with policing their borders against a foe they could not pursue，while still maintaining control over their own cities.
This precarity was responsible for the fact that these early empires were not especially long-lasting，and were unable to conquer territory outside of Mesopotamia itself. What came afterwards were the first early empires that，through a combination of governing techniques，beliefs，and technology，were able to grow much larger and more powerful.