What was a primary reason for the crumbling of Europe's overseas empires after World War II?

One of the primary reasons for the crumbling of Europe's overseas empires after World War II was the rise of nationalist movements in colonies and territories that sought independence and self-determination. These movements were often fueled by resentment towards colonial rule, as well as inspired by the principles of self-determination and decolonization that were promoted by the Allies during and after the war. Additionally, the economic and political instability in Europe in the aftermath of World War II made it increasingly difficult for colonial powers to maintain control over distant territories, leading to the eventual dismantling of many overseas empires.