There are far less wars than there we're 20,30,40 or even 50 years ago.I suggest you go to Strategypage where they talk non-stop about this stuff.The world is slowly becoming more open,less dictatorial and more educated.Slowly that is.We are enjoying the longest period of peace between the great powers in over 400 years.This is as good as it gets.
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WW1 we sent the Lusitania into German warzone. WW2 we knew about Pearl Harbor. Vietnam we staged a fake attack (Gulf of Tonkin). We installed many dictators around the world. 9/11 is questionable but Govt probably knew.