Some history and some facts about the U.S.:

https://en.wikipedia.org/wiki/Overseas_interventions_of_the_...

https://en.wikipedia.org/wiki/Covert_United_States_foreign_r...

https://en.wikipedia.org/wiki/Timeline_of_United_States_mili...

http://qz.com/374138/these-are-all-the-countries-where-the-u...

http://www.statista.com/statistics/262962/countries-with-the...