Why was it necessary to process immigrants to the United States through a place such as Ellis Island? explain I will give Brainliest!

Ellis Island,It served as the nation's major immigration station from 1892 to 1924

Many thousands of immigrants came to know Ellis Island as detained petitioners to the New World,

These determined individuals had crossed oceans, under the burden of fear and persecution, famine and numbing poverty, to make a new life in America.

Many thousands of immigrants came to know Ellis Island as "detained petitioners to the New World." These determined individuals had crossed oceans, under the burden of fear and persecution, famine and numbing poverty, to make a new life in America.

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a. competition between france and england for land and power