Why did many immigrant groups migrate to the United States?

In the late 19th century, people in many parts of the world decided to leave their homes and immigrate to the United States. Fleeing crop failures, land and employment shortages, tax increases and famine, many people came to the United States because it was seen as a place of economic opportunity.

not sure might be he acquired the entire oregon territory from great britain

the federal constitution of the united mexican states of 1824 was enacted on october 4 of 1824, after the overthrow of the mexican empire of agustin de iturbide. in the new constitution, the republic took the name of of united mexican states. it was replaced by the federal constitution of the united mexican states in 1857.