International migration is a major issue in many parts of the world today. In the United States, with its history of immigration, it has been a recurring theme in political discussion for over two centuries. This article addresses three issues: (1) providing data to establish the size, composition, and recent trends in immigration to the U.S. today, (2) a review of 2018 U.S. public opinion polls on immigration, and (3) an interpretation of why a subject where most Americans generally agree has caused protracted emotional and divisive debates over the past two decades.
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