Immigrant policy which U.S have until the 1880s is "open shore policy"
What was the immigration policy till 1880s?
Americans encouraged relatively free and open immigration during the 18th and early 19th centuries, and rarely questioned that policy until the late 1800s. After certain states passed immigration laws following the Civil War, the Supreme Court in 1875 declared regulation of immigration a federal responsibility. Thus, as the number of immigrants rose in the 1880s and economic conditions in some areas worsened, Congress began to pass immigration legislation.
Hence, option A is correct.
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