They both instead territory in the US, resulted in territory being taken from the US, and both involved land being forcibly taken from Mexico
The correct answer should probably be The Mayan civilization was not built around a major river.
Most Mayan cities were found by archeologists deep inside of jungles, hidden from the world, away from rivers, whereas Mesopotamia was built on Tigris and Euphrates.
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They didn't encourage it, but they did it to expand their empire, wealth, and power, through exploring the New World.