Horseshoe Theory is an idea in political science. It asserts that the far-right is more similar to the far-left than to the center-right and vice versa. Horseshoe Theory is often used as argument for centrism.
The name Horseshoe Theory comes from the idea that politics is not a straight line from left to right but bent like a horseshoe so that the two ends (the far-left and the far-right) share more similarities with each other than their moderate counterparts.
Philosopher Jean-Pierre Faye invented Horseshoe Theory after observation of Nazi Germany and the Soviet Union's joint invasion of Poland which started World War II.[1]