Before WWII, the US enjoyed a period where we were, in effect, insulated and isolated from most of the rest of the world by two oceans. However, technology began to make this a very small world. When Pearl Harbor was bombed, this sleeping giant was indeed awaken, and in a very bad mood! And wasn't much of the free world glad that we entered that war!
Although many people in the US would love to retreat into isolation again, it is just not possible. Crossing the oceans is as easy as catching a ride across town. We, much to our consternation, seem to be the world's police force, and you know how much cops are respected! It is funny how we are expected to pay for such things as up keep, etc. for the United Nations, with American tax dollars, a place for many of the nations of the world are all supposed to meet. Yet we face nations that are severe violaters of human rights on the human rights committee chairs.
Sometimes we do stick our nose in others business and sometimes we get the war dropped on our doorstep. I don't think the Europeans were upset when thousands of Americans lives were lost fighting WWII. In fact where would they be today with out the help we provided? Where would the world be?
Why are people surprized when the sleeping giant again is rudely routed from it's slumber? I don't always like the policies of my country, but I would die for it any day, any time, any where. It ain't perfect, but I have yet to see a better place to be!

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Insanity: doing the same thing over and over again and expecting different results.
Albert Einstein