What reasons motivate people to immigrate to the United States

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What reasons motivate people to immigrate to the United States?
We know that most newcomers leave behind poverty and unemployment in their homelands in search of better fortunes in America. However, research on this subject suggest that the causes of immigration are often more complex and numerous than most assume. The capacity of natural disasters, environmental crises, overpopulation, wars, and civil unrest to uproot and set in motion millions of people around the globe and refugee and asylum policies that extend relief to some non-citizens fleeing political, ethnic…