With more than 40 million immigrants, the United States is the top destination in the world for those moving from one country to another. Mexico, which shares a nearly 2,000-mile border with the U.S., is the source of the largest wave of immigration in history from a single country to the United States.

But today’s volume of immigrants, in some ways, is a return to America’s past. A century ago, the U.S. experienced another large wave of immigrants. Although smaller at 18.2 million, they hailed largely from Europe. Many Americans can trace their roots to that wave of migrants from 1890-1919, when Germany dominated as the country sending the most immigrants to many of the U.S. states, although the United Kingdom, Canada and Italy were also strongly represented.

via From Germany to Mexico: How America’s source of immigrants has changed over a century | Pew Research Center.