ONE OF THE most important dates in American history passed unnoticed last weekend. It was the 225th anniversary of the day we didn't become a banana republic. It ought to be a national holiday, right up there with July Fourth. But hardly anybody remembers it any more. The date was March 15, 1783. The Revolutionary War had just been won. Trouble was, the army hadn't been paid during the war. They were promised that they'd get their money when the war was over; but now that the time had come, Congress was reneging on that pledge. Resentment rippled through the...