From an historical point of view the Europeans have been a war culture for at least 2,000 years. If you want to count Alexander the Macedon and the early Roman era, the Europeans have been fighting 'civilized' wars for about 2,250 years. What exists as a present day European citizen, is the end result of warring cultures mixing on the continent for over 2,000 years. Europeans have achieved numerous advances in the science and the arts, but at the end of The European 2,000 Year Reich, one must begin to question, at just what price ?
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Most of the world has been in a state of barbarity for 2,000 years plus. The US has an interesting past also (Native Americans, Slavery, Civil Rights etc etc).
But the past means very little compared to modern day US or Europe. Both places have "civilised".
In fact most of the '2000 year old european war history' that was quoted we have in common. There is no US history to be differentiated from the European history on that scale of time.