Why did the u. s. government open ellis island in 1892

Ellis Island is an island that is located in Upper New York Bay in the Port of New York and New Jersey, United States. It was the gateway for millions of immigrants to the United States as the nation's busiest immigrant inspection station from 1892 until 1954.

The U.S. Government open Ellis Island so it was place where immigrants get checked and stayed for the time being. This was a crucial part of our immigration history.
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These islands/chinampas then provided rich soil for crops with easy access to water. i hope this is correct, im so sorry if its not !