close Washington DC to host Great American State Fair for America250 Ambassador Monica Crowley details plans for the America250 Great American State Fair. It will transform D.C.'s National Mall with 50 states, 6 territories, a 110-ft ferris wheel, rides and themed events from June 25th to July 10th. NEW You can now listen to Fox News articles! Trump Derangement Syndrome struck again this week, as somehow something as pure Americana as the nation's 250th birthday State Fair , planned for the