Because of the proposal president Truman endorsed on equal rights amendment to the United States.
The Mesopotamia has a good farm land that can feed all its population bringing in more people making it easy to feed more people because of the farm land they have. They created things like farming and irrigation so that they are suited for growth.
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At the time the vast majority of the Texian population favored the annexation of the Republic by the United States. His official motivation was to outmaneuver suspected diplomatic efforts by the British government for emancipation of slaves in Texas, which would undermine slavery in the United States..
Explanation: