No one really knows how much the U.S. government can borrow before global investors get uneasy and begin to demand higher interest rates. The national debt exceeded 100 percent of GDP during World War II and then came down as the economy sprinted. But history suggests debt of that level is in the danger zone. Think Argentina, circa 2001. Think Greece, circa 2012.

Ultimately, what matters is where Congress and the president end up, not where they start. But defining the starting point and crafting the baseline are important to the politics and public perceptions of the budget—they are used by one side to magnify the size of the spending cuts or tax changes proposed by the other side—and politics and perceptions have a lot to do with what actually happens.

Back in 1955, when the federal debt was much smaller, less than 5 percent was held by foreigners. Foreign holdings began to climb in 1970 and surged in the 2000s. Today, foreign governments and private investors hold nearly half of all the U.S. government debt outstanding.

In response to years of calls to control “spending” and “smaller government,” Congress and presidents have discovered something simple: giving people a tax break—a credit, a loophole, a deduction—makes them happy without increasing government “spending” and can accomplish the same objective. Practically and economically, there’s no difference between getting $1,000 in cash from the government and getting a $1,000 voucher that you can use to reduce your taxes. Either results in a federal budget deficit that’s $1,000 bigger than it would have been had a tax break not been created. But the first is called “spending” (boos, hisses) and the second is called “a tax cut” (applause, cheers). The first is formally recorded on the budget books as an outflow of money. The second doesn’t show up in the outflow and inflow accounting. It is revenue that wasn’t collected.

In the high-volume debate over taxes, facts about basic issues—who pays? how much? who doesn’t?—often get lost, twisted, or distorted. Perhaps the most salient and overlooked fact is this one: for most Americans, federal taxes have not risen over the past couple of decades.

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Until the Civil War, the U.S. government relied almost exclusively on tariffs on imported goods, a practice that provoked conflict between Northern manufacturers who favored tariffs to keep imports out and Southern farmers who did not. An income tax was imposed during the Civil War, but proved so unpopular that it died in 1872. In its place, the government imposed taxes on alcohol and tobacco that accounted for 43 percent of all federal revenue by 1900. Repeated attempts to revive the income tax were thwarted when the Supreme Court declared it unconstitutional in 1895. But the Sixteenth Amendment to the Constitution changed that. Less than eight months after it was ratified in February 1913, Congress enacted an income tax.

The public remains strikingly misinformed about the budget. The typical respondent to a CNN poll said food stamps accounted for 10 percent of federal spending; it’s closer to 2 percent. Maybe being off by a factor of five is understandable given the enormity and complexity of the budget. But it’s harder to make sense of a 2008 Cornell University poll in which 44 percent of those who receive Social Security checks and 40 percent of those covered by Medicare say they “have not used a government social program.”

Reagan enjoyed many victories as president. But starving the beast was not one of them. When he left office, federal spending was 20 percent higher, adjusted for inflation, than it had been when he arrived, and he never found a way to pay for it. In the twenty years before Reagan became president—under Kennedy, Johnson, Nixon, and Carter—the budget deficit averaged well under 1 percent of GDP. In Reagan’s eight years, it averaged 4.25 percent of GDP.