The Kaiser abdicates his throne and the next day is replaced with Socialist leader Friedrich Ebert - new leader of the Republic of Germany.
WW1 ends and Germany is defeated, leaving the country destroyed.
E.g Reparations, army limited to 100,000, no overseas colonies etc.
Gustav Stresemann becomes Chancellor. He replaced the German currency with Rentenmark, fixing the problem of hyperinflation. He also renegotiated reparations and the economy recovered rapidly.
Hitler led an attempted rebellion in Munich. He received ans short prison sentence, suggesting Weimar's right-wing opponents were in high up positions (e.g judge).
Germany get defeated and Hitler commits suicide.