Which is the most complete explanation of why people immigrated to the United States in the late 1800s and early 1900s?

People immigrated for several connected reasons. Push factors, such as poverty, persecution, or limited opportunities in their home countries, drove people to leave; pull factors, such as jobs and the hope of a better life in the United States, attracted them. Thus, “a combination of push factors and pull factors” is the most complete explanation. Increased employment opportunities were one pull factor, but not the whole explanation.

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