Between 1820 and 2013, nearly 79.5 million immigrants have become lawful permanent residents of the United States according to the Department of Homeland Security’s records. The chart below shows the volume of U.S. immigration by immigrant continent of origin for each decade since 1820. (Note that the volume of immigration drops for 2010-2013 because the decade is only partially complete.) There have been three major waves of immigration into the United States since 1820, marked…

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