Of course our whole national history has been one of expansion… That the barbarians recede or are conquered, with the attendant fact that peace follows their retrogression or conquest, is due solely to the power of the mighty civilized races which have not lost their fighting instinct, and which by their expansion are gradually bringing peace into the red wastes where the barbarian peoples of the world hold sway.
—Theodore Roosevelt
The Strenuous Life, 1901