What document forced Germany to accept guilt for World War 1 and pay reparations?

The Treaty of Versailles, signed in 1919, forced Germany to accept guilt for World War I through Article 231, often referred to as the "War Guilt Clause." This clause placed full responsibility for the war on Germany and its allies, leading to significant reparations payments. The treaty imposed harsh penalties and territorial losses on Germany, contributing to widespread resentment and economic hardship in the country.