The Fall of the Berlin Wall
Through 1989, communist governments across Eastern Europe fell one after another — Poland, Hungary, Czechoslovakia — as Moscow, exhausted and reforming under Gorbachev, declined to send the tanks that had crushed earlier revolts. In November an East German spokesman, badly briefed, told a press conference that new travel rules took effect immediately; East Berliners heard it on the news, walked to the checkpoints, and the outnumbered guards opened the gates rather than shoot. The wall came down by hand. It was a regime falling not to an army but to the simple, sudden withdrawal of belief — including, in the end, by the men holding the guns.
The story that justifies an order (divine right, mandate, ideology) loses credibility; the order it propped up follows.