Answer:
Mesopotamia was settled between the two rivers to take advantage of the fertile soil produced by floods.
Step-by-step explanation:
The historic region lying between the Tigris and the Euphrates in the northeast of the Middle East is Mesopotamia. The historic nucleus of the territory is roughly equivalent to central Iraq today, but the name is also used to designate an area that includes Iraq, eastern Syria, parts of southeastern Turkey and southwestern Iran. It forms the eastern end of the Fertile Crescent and is known as the cradle of civilization. The land between the two rivers and their banks is extremely fertile because it is alluvial; every time those rivers overflow, alluvium is left behind.
The first people to capitalize on this were the Sumerians, who settled in Mesopotamia around 4,000 BC to cultivate the fertile land and grow crops. They established one of the first civilizations in world history that flourished in the city-states of Ur, Kish, Uruk and other sites. Then other settlers came to the area and the Akkad empire, founded by Sargon in Kish, came to dominate the country. The city of Babylon became the capital of Mesopotamia under king Hammurabi, famous for the detailed laws drawn up during his reign. After Hammurabi the region was occupied by new invaders - the Casas, the Assyrians and the Persians - and Mesopotamia surrendered to Ancient Egypt as a precursor of Ancient civilization. It later came under the control of Alexander the Great and his successors, the Roman Empire and the Persians before being subdued by the Muslims in the 7th century.