The region of the Near East between the Tigris and Euphrates Rivers, called Mesopotamia (meaning "between the rivers"), is thought to be the birthplace of civilization--non-nomadic societies characterized by agriculture and cities. The inhabitants of Mesopotamia raised crops on this rich but dry land by developing and using complex irrigation systems so successful they resulted in a surplus of food. This in turn led to population growth and the emergence of cities.
Like the people of Mesopotamia, the Egyptians took advantage of a water source, the Nile River, to irrigate arid land and produce a surplus of food. The river also acted as a highway for traveling north to the Mediterranean and south to Nubia (present-day Sudan). Egypt enjoyed a degree of safety because of its location: The only easy land route into and out of Egypt lay through the northern Sinai Peninsula to the coast of the Levant. Egyptian rulers always fought for control of these areas.

King Solomon ruled Israel from 960 to 622 B.C.E. This "Golden Age of Israel" was prosperous and peaceful. After Solomon's death, however, the kingdom was divided into two states, Israel in the north and Judah in the south. Israel vanished as a political entity in 722 B.C.E., and its people were dispersed throughout the Near East. In 597 B.C.E. Judah was conquered by King Nebuchadnezzar of Babylon, and in 586 B.C.E. most of the Jewish survivors were deported to Babylon, becoming the first diaspora community.

Although they reached unprecedented cultural heights in art, drama, philosophy, and architecture, the Greeks failed to achieve political unity and harmony. Athens and Sparta, along with their respective allies, fought the bloody and costly Peloponnesian War (431-404 B.C.E.). Defeating the Athenians, the Spartans then tried to become an international power by sending campaigns east into Anatolia (present-day Turkey), threatening the Persians who then ruled most of Anatolia and resulting in ongoing turmoil in the Mediterranean.
For close to one hundred fifty years, Rome steadily expanded its borders. In 30 B.C.E. Octavian (the future emperor Augustus) captured Egypt following the suicides of Mark Antony and Cleopatra. Imperial conquest reached its height in 114-117 C.E., when Emperor Trajan seized southern Mesopotamia, the farthest east Rome had yet extended.
Two early Indian cities, Harappa and Mohenjo-Daro, located along the Indus River, underwent first a gradual decay and then sudden destruction around 1500 B.C.E. Although archaeologists still search for explanations for these civilizations' demise, they do know it was hastened by the arrival of the Aryans from Central Asia. After 1000 B.C.E., the Aryans continued to migrate into India, mixing with and replacing indigenous peoples.
About 250 B.C.E., political power in China was dispersed among the seven so-called warring states: Han, Wei, Zhao, Qin, Qu, Yen, and Qi. All maintained fortifications and engaged in intermittent conflict, but Qin emerged as the most technologically and militarily powerful state. In 221 B.C.E., after a decade of war, all seven states were united under the conquering Qin.