The Hated Treaty of Versailles, 1919
The Treaty of Versailles became the Weimar Republic's biggest nightmare. Signed on 28th June 1919, it was forced on Germany by Britain, France, and America - Germans had zero say in it. They called it the 'Diktat' (dictated peace) and absolutely despised every part of it.
Article 231 (the War Guilt Clause) forced Germany to accept full blame for WWI. The military was slashed to just 100,000 men, no tanks, no air force, and only 6 battleships. The Rhineland was demilitarised, making Germany feel completely defenseless.
Territorially, Germany lost 13% of its land and 6 million Germans. Alsace-Lorraine went back to France, parts went to Poland creating the Polish Corridor, and the Saar coalfields were given to France for 15 years. The £6.6 billion reparations were financially crippling.
Germans blamed the 'November Criminals' (Weimar politicians) for this betrayal, believing they'd stabbed Germany in the back. This Dolchstoss Theory would haunt the republic for years, giving extremist groups perfect ammunition against democracy.
Think About It: The treaty was designed to weaken Germany permanently, but it actually created the perfect conditions for extremism to flourish.