U.S. migration patterns changed plenty from 1850 to 2013. A nifty interactive map, created by the Pew Research Center, visualizes these shifts by showing the origin of the dominant immigrant group in each state for every decade during this time period.
The map is a part of a comprehensive report on past and future immigrationtrends, the main point of which is to highlight the impact of the Immigration Act of 1965. But the map reveals the events, policies, and trends before and after 1965 that shaped the waves of U.S. immigration.
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