Post World War I

Extremist political parties rose all over the world following World War I.  Post WWI Europe was more likely to accept and join these extreme political views than post war North America.  Why?

Paris Peace Conference 1919

http://www.youtube.com/watch?v=ShRA8HRMR4Q

The peace of WWI was almost doomed to failure.  Explain.

European or World War?

It has been said that World War One was a European War that brought the World to its stage.  Would you consider the First World War a World War or a European War?  Justify your view.