Why did the united states follow a policy of open immigration for european during most of the 1800s

In the late 1800s, people in many parts of the world decided to leave their homes and immigrate to the United States. Fleeing crop failure, land and job shortages, rising taxes, and famine, many came to the U. S. because it was perceived as the land of economic opportunity.

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d.prevent the spread of communism outside of eastern europe.

the answer is "focused on"

lol gave an answer 1 week that's the answer for those who need it in the future xd