The Answer is a I just took the test, and it didn't eliminate the need of a railroad, nor was it constructed on a land with few plants or animals, it was in a jungle like environment.
ANSWER IS A
A cause was that Texas declared its independence from Mexico. It changed the U.S. by the U.S. gaining California, New Mexico, Utah, Arizona, Colorado and parts of Wyoming.
Critics of the Articles of Confederation argued that it was far too "weak" in the sense that it didn't give the federal government enough power over the states. This became especially evident after Shays' Rebellion, which proved very difficult to put down.
The correct answer is the Utah territory. This was done as a compromise on allowing new states into the union. The states in the region actually did support slavery and the vote passed even though it had been previously forbidden. This was because it was in the south where slavery was a common thing.
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