Every Country makes mistakes, and yes the United States government has done bad things as well. A 'few' of them are:
Political Greed. We must remember that all creatures are greedy, it is only through intelligence that we can attempt to over come greed. The problem is we, each and every one of us, need to use our intelligence to watch out for the leaders that are not over coming greed.
To quote, if I may, Buddha-"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense.
I hope this helps to shed light on your question.