Streaker Streaker:
Never mind the few hundred thousand dead in Iraq. Of well.... shit happens...

The US is the world's only superpower right now. They reign. Part of the reason they are in that position is a dedication, throughout their history, to military power. Continuing military supremacy, I would argue, is dependent on perpetual war. They need war to survive.
$1:
"This long peace, and the uniform government, introduced a slow and secret poison into the vitals of the empire. The minds of men were gradually reduced to the same level, the fire of genius was extinguished, and even the military spirit evaporated. Their personal valor remained, but they no longer possessed that public courage which is nourished by the love of independence, the sense of national honor, the presence of danger, and the habit of command... The posterity of their boldest leaders was contented with the rank of citizens and subjects... A cloud of critics, of compilers, of commentators, darkened the face of learning, and the decline of genius was soon followed by the corruption of taste." -- Gibbon, Decline and Fall of the Roman Empire