This site will give you a good place to start.
http://wiki.answers.com/Q/What_was_the_importance_of_World_War_1_to_the_world
This site will explain the results of WW1 on the world.
http://en.wikipedia.org/wiki/Aftermath_of_World_War_I
Sorry another significance question...
What was the significance of the Outbreak of WWI in Europe?
Would it be that it caused countries in Europe to become invovled in the war
1 answer