Founded in 1636 as the first Springfield in the New World, during the American Revolution, George Washington designated it as the site of the Springfield Armory for its central location, subsequently the site of Shays' Rebellion. The city would also play a pivotal role in the Civil War, as a stop on the Underground Railroad and home of abolitionist John Brown, widely known for his raid on Harpers Ferry, and for the Armory's manufacture of the famed "Springfield rifles" used ubiquitously by Union troops. Closing during the Johnson administration, today the national park site features the largest collection of historic American firearms in the world. Today the city is the largest in western New England, and the urban, economic, and media capital of Massachusetts' section of the Connecticut River Valley, colloquially known as the Pioneer Valley.