Amid a flurry of anti-immigration rhetoric coming from certain GOP presidential candidates, a new interactive map reminds us just how much of our country's foundation was built on the backs of foreign-born citizens. Foreign-Born Population: A Nation of Overlapping Diasporas visualizes America's history of immigration from the 1850s to 2010.

By clicking on a particular area of the country and shifting your cursor along the timeline below, you can see where people were migrating from during a particular period, and how immigration has shifted over time. The visualization is part of a larger project called American Panorama at University of Richmond's Digital Scholarship Lab.

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Source: http://www.fastcodesign.com/