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  1. In absolute numbers, the United States has by far the highest number of immigrants in the world, with 50,661,149 people as of 2019. [1] [2] This represents 19.1% of the 244 million international migrants worldwide, and 14.4% of the United States' population.

  2. t. e. U.S. Citizenship and Immigration Services ( USCIS) [3] is an agency of the United States Department of Homeland Security (DHS) that administers the country's naturalization and immigration system. It is a successor to the Immigration and Naturalization Service (INS), which was dissolved by the Homeland Security Act of 2002 and replaced by ...

  3. During the 18th and most of the 19th centuries, the United States had limited regulation of immigration and naturalization at a national level. Under a mostly prevailing "open border" policy, immigration was generally welcomed, although citizenship was limited to “white persons” as of 1790, and naturalization subject to five year residency ...

  4. Dec 21, 2018 · The 1882 Act is the first in American history to place broad restrictions on certain immigrant groups. 1891: The Immigration Act of 1891 further excludes who can enter the United States, barring ...

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