Why did over 30 countries become involved in the war effort during World War I? (original) (raw)

Question:

Why did over 30 countries become involved in the war effort during World War I?

Answer:

Show Answer

In 1914, there was an alliance system in place between various countries around the world, a system of secret treaties. As a result, other countries began to join one side or the other in this war based on their secret treaties and/or which side they believed would benefit them the most. Causes of World War I