Final answer:
The four main causes of World War 1 were militarism, alliances, imperialism, and nationalism.
Step-by-step explanation:
The four main causes of World War 1 were:
- Militarism: The arms race among the major powers of Europe, particularly Germany and Britain, led to an increase in military forces and tensions.
- Alliances: The complex system of alliances formed by European powers meant that a conflict between two countries could quickly escalate into a larger war with multiple nations involved.
- Imperialism: The competition for colonies and resources among European powers created rivalries and tensions.
- Nationalism: The intense pride and loyalty to one's nation led to aggressive and expansionist policies, contributing to the overall atmosphere of conflict.