Around 20 million immigrants came in through New York City from the 1850s to the early 1920s. Today, 40 percent of Americans have at least one ancestor who came in through Ellis Island, according to history.com.
We take a look at the history through audio clips and Tom Gjelten, NPR religion correspondent and the author of A Nation of Nations: A Great American Immigration Story (Simon & Schuster, 2015), assesses the impact of post-1965 immigration on U.S. demographics and politics.