By 1914 tensions between European countries were mainly due to strong feelings of?

By 1914, tensions between European countries were primarily fueled by strong feelings of nationalism, militarism, and Imperialism. Nationalistic fervor led nations to assert their dominance and seek greater territorial control, while militarism resulted in an arms race and a belief in military solutions to conflicts. Additionally, imperial ambitions created rivalries as countries competed for colonies and resources. These factors combined to create a volatile atmosphere that ultimately contributed to the outbreak of World War I.