What was the alliance system of treaties that existed in Europe in 1914? How did this system draw so many countries into the conflict?

I’m working on a history case study and need a sample draft to help me learn.

Respond to ONE of the following questions. 

1. What was the alliance system of treaties that existed in Europe in 1914? How did this system draw so many countries into the conflict? What was the catalyst that lit the fuse for World War I?
2. While Europe was drawn into war what was the United States doing? How did the United States benefit from the war? How did the the United States get drawn into the war?
3. How was WWI different? What new technologies were introduced to war? How did this change the face of war? What does the term Total War mean? How was it applied to World War I?
4. How did Woodrow Wilson’s “Fourteen Points” influence Germany’s decision to cease hostilities? How were the terms of the Treaty of Versailles different from the “Fourteen Points”? What terms did the Germans have to accept? Were the terms fair? Explain your answer.