Who was upset by the outcome of the treaties following World War?

Many countries were upset by the outcomes of the treaties following World War I, particularly Germany, which felt humiliated by the harsh terms of the Treaty of Versailles. The treaty imposed heavy reparations, territorial losses, and military restrictions, leading to widespread resentment among the German population. Additionally, other nations, like Italy, were dissatisfied with the peace settlements, feeling that they did not receive the territorial gains promised in the Treaty of London. This discontent contributed to political instability and the rise of extremist movements in the interwar period.