Umm... Maybe this doesn't make any difference, but 500 BC? Not counting native history (which I admittably don't know much about), America is a much younger country than that. Also, the wars you listed involved many nations, some now dead. The US grew very quickly compared to other nations, but it's not fair to compare an entire continent's timeline back to a point where the total time to the present is nearly eight times as long as the age of the US, now is it?
(Bleh, forgive me if it's not eight times, my math skills are not great.)
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