What were the causes of international tension in the early 1900s?

In the early 1900s, international tension was primarily fueled by Imperialism, as major powers like Britain, France, and Germany competed for colonies and resources, particularly in Africa and Asia. Nationalism also played a significant role, with countries seeking to assert their dominance and unify ethnically or culturally similar groups. Additionally, military alliances and arms races, particularly in Europe, heightened fears and mistrust among nations, setting the stage for conflict. These factors combined created a volatile environment that ultimately contributed to the outbreak of World War I.