Erm, war. As in, war = big debt.
After the Revolutionary War, the debt amounted to 75 million. This was whittled down to 45 mil just before the War of 1812, which tripled it to 127 mil.
Somehow, this got almost completely paid off by 1835, after which there was a spike up, then a settling back to 15 mil just before the Mexican-American war, which quadrupled it to 63 mil.
Source: Debt to the penny, history, 1791-1849
On the eve of the Civil War, the debt stood at a slightly higher 65 mil, but by the time that catastrophe was over it was up to 2.7 billion bucks, practically real money.
Debt to the penny, 1850-1899
It sorta wandered around disconsolately after that, and on the eve of WWI stood at 2.9 billion, slightly higher than where it was after the Civil War. By the end of this mess, it was up to 27 billion, which begins to look like modern times, eh? We’re making progress.
It stood at 40 billion or so on the eve of WWII, what with the Depression, although that didn’t even amount to a doubling, chicken feed next to the nearly tenfold increase caused by WWI. By the end of WWII, it was up to 269 billion, more than eight times higher, dwarfing the increase caused by the Depression.
Debt to the penny, 1900-1949
Modern times now. Korea and Vietnam didn’t do too much damage, raising the debt to 493 billion by 1974. After that came the “malaise” of the late seventies, which more than doubled it to a trillion and a bit by 1981.
Reagan then decided to fight the Cold War with a vengeance. By the time Bush I came along, it was up to 2.8 bil, a near tripling.
Bush I got it up to 4.4 bil, not bad considering he only had four years and a relatively small war.
Debt to the penny, 1950-2000
Clinton saw a relatively modest increase, percentagewise, to 5.8 billion, up 1.4 bil over eight years. Piker.
Bush II’s got us to nearly 8 billion with his “war on terrorism”. Not much percentagewise, actually, because there hasn’t been a major war through here. So, really, he’s only a shadow of, say, Reagan.
Conclusion: those peacetime increases may look big, but if you want increases of orders of magnitude, you need a big, fat war. Something quite a bit bigger than the one we’re in now. (And, of course, social spending barely figures in the accumulation of this debt, contrary to right-wing myth.)
The current account deficit, which is only partially a function of the fiscal deficit, which is only partially a function of this accumulated debt, is what we should really be worried about, IMO. Once that causes problems, the accumulated debt really will be a problem, because we’ll have real trouble selling more debt, and may even have to start paying it off at the same time as we’re trying to fund the retirement of the baby boomers. That would be inconvenient, to say the least.