Ineed to write an essay, on how do conflict and cooperation among groups
and organizations influence the development of the world?
i can do it on germany, france , britain, italy, or the united states.
what country should i do it on and give me three examples of the correlation with the prompt.

Oh man. Always pick the United States. All we do is either help or cause conflict. Either way, we are ALWAYS involved somehow. 

1) The intervention in Cuba when the U.S tried to over throw the government. 
2) You can talk about the U.S's role in the UN. We have done a lot to influence others countries there. 
3) We took down the USSR, which improved Russia's relationship with the world as well as saved millions of citizens within it. 

From mexican american war , us gained new mexico.