Final answer:
The 4 main causes of World War 1 were Militarism, Alliances, Imperialism, and Nationalism.
Step-by-step explanation:
The 4 main causes of World War 1 were Militarism, Alliances, Imperialism, and Nationalism. These factors contributed to the tension and rivalries between the Great Powers of Europe, leading to the outbreak of the war. Militarism refers to the arms race and the belief in the power of military strength. Alliances were formed between countries, which meant that if one country was attacked, its allies would join the fight. Imperialism refers to the competition for colonies and resources, which created rivalries between nations. Nationalism, on the other hand, refers to the strong sense of pride and loyalty to one's own nation, often leading to conflicts with other nations.