Who came closest to shutting down the U.S. Government: the Soviets? Islamic Terrorists? Or the GOP?

For over 200 years, the America has been the source of world freedom. It has been the dream of every tyrant, since the 18th Century, to shutdown Washington D.C. Thank God that the current Congress wasn't "running the show" during the American Civil War, the Great Depression; the Second World War, the Civil Rights Movement, the moon landings; the creation of Social Security, the Cold War, or the creation of the EPA, and Reagan - and Clinton Administrations. And a million other events.