Cowboys in camp do it.

Men and women in Eastern cities, persons with at least the external trappings of educated intelligence, play into the hands of the Germany of to-morrow, do their unconscious little bit of harm to the future of freedom and civilization, by repeating that England "has always been our enemy." Then they mention the Revolution, the War of 1812, and England's attitude during our Civil War, just as they invariably mentioned these things in 1917 and 1918, when England was our ally in a struggle (or life, and as they will be mentioning them in 1940, I presume, if they are still alive at that time).
Now, the Civil War ended fifty-five years ago, the War of 1812 one hundred and five, and the Revolution one hundred and thirty-seven.
Suppose, while the Kaiser was butchering Belgium because she barred his way to that dinner he was going to eat in Paris in October, 1914, that France had said, "England is my hereditary enemy.

Henry the Fifth and the Duke of Wellington and sundry Plantagenets fought me"; and suppose England had said, "I don't care much for France.

Joan of Arc and Napoleon and sundry other French fought me"-- suppose they had sat nursing their ancient grudges like that?
Well, the Kaiser would have dined in Paris according to his plan.

And next, according to his plan, with the Channel ports taken he would have dined in London.