What mistake was made that led to the Berlin Wall coming down

answer:

After the Politburo deposed Erich Honecker in an effort to reduce the repressive image of the regime, Günter Schabowski became East Germany's press spokesman.

Explanation:

frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. but frederick disliked rifle shooting and horseback riding. unlike his father, he was interested in french literature. he enjoyed poetry and music and, like some others of the enlightenment, he scoffed at religion. his father thought him soft, frivolous and unmindful of his duties. and when frederick refused to put his signature on a right to succession, for a few moments his father strangled him.