German Empire
The high command under Paul von Hindenburg and Erich Ludendorff increasingly controlled the country, but in October after the failed offensive in spring 1918, the German armies were in retreat, allies Austria-Hungary and the Ottoman Empire had collapsed, and Bulgaria had surrendered. The Empire collapsed in the November 1918 Revolution with the abdications of its monarchs. This left a postwar federal republic and a devastated and unsatisfied populace, which later led to the rise of Adolf Hitler and Nazism.
Inner German border
The fall of the inner German border came rapidly and unexpectedly in November 1989, along with the fall of the Berlin Wall. Its integrity had been fatally compromised in May 1989 when the Hungarian government began dismantling its border fence with Austria. The government was still notionally Communist but planned free elections and economic reform as part of a strategy of "rejoining Europe" and reforming its struggling economy.