How did events of the First World War influence the 20th century?

The First World War significantly reshaped the geopolitical landscape of the 20th century, leading to the collapse of empires such as the Austro-Hungarian and Ottoman Empires and the emergence of new nations. The war also set the stage for economic turmoil and political instability, contributing to the rise of totalitarian regimes and World War II. Additionally, the social changes initiated during the war, including shifts in gender roles and the push for civil rights, laid the groundwork for various social movements throughout the century. Overall, the war's impact was profound, influencing international relations, societal structures, and political ideologies for decades to come.