WHY did a conflict between two nations evolve into a World War?

Alliances

Explanation:

Many countries created alliances with other countries. These agreements said that the countries would not attack each other and they would protect each other if one country was attacked. When two nations began to fight, the countries they had alliances with also got sucked into the conflict. Eventually, these tangles of alliances pulled in so many other nations, it created a global conflict.

answer: what events

explanation:

you dont have any choices

punish germany and keep it weak,