How Far Can the National Debt Go Before China and Other Countries Decide to Stop Lending Us Money?

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The National Debt is currently at 12.5 trillion dollars, and rising by the second. Now, it doesn’t look like that money will be paid off anytime soon. It is the result of years of massive military and social spending, predominantly. Under Reagan, the National Debt rose substantially due to the ridiculous military buildup that the regime oversaw, along with massive overall regime expansion, and during his presidency, the US went from being the largest creditor nation on earth to the largest debtor nation. So my question is how do we take care of this problem?

Why Are Conservatives So Dishonest About the National Debt?

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Conservatives tout that the US national debt is an emerging crisis that will soon bankrupt the United States. What they don’t say is that a small less than half is intragovernmental debt. That is, money the US regime owes itself. After WWII the US owed 120% of its GDP in public debt. At this time it only owes about 84% and that figure includes the money the regime owes itself. Public debt, what money the govermenet owes others, is about 60% of GDP or half the GDP to debt ratio after WWII.
Why do conservatives try to scare people about a problem that does not exist?