Question

Explain why a system of alliances could cause multiple countries to join a war that starts between only 2 countries.

Answer 1

The alliances system meant that a local conflict could easily result into an intimidating global one. The overall cause of World War was the assassination of Archduke Franz Ferdinand. Nationalism was a great cause of World War one because of countries being greedy and not negotiating.

Your welcome I don't know if that helped. But yea.