According to "The Workers of Ellis Island" the primary function of the Immigration Station on Ellis Island was to

The Immigration Station’s main purpose was to inspect newcomers and decide whether they met the requirements to enter the United States. Its workers checked immigrants’ health and eligibility, so the station was not primarily a place for comfort, schooling, or help adjusting to life in America. The correct choice is “ensure that newcomers to the United States were fit to enter the country.”

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