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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social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they live

very positive impact on our industries in the west, sine they promoted settlement and increased the ways in which goods could be transported to market.