It's really normal, my previous post showed US holding of foreign debt. It should be a net of zero. The U.S. has about a 3 to 2 ratio of international debt owed to debt held.
It is diversification of the customers for the debt, if the U.S. doesn't sell them abroad it will have to raise interest rates to entice buyers (which doesn't guarantee buyers).
If a foreign country buys $100 in US debt for 10 years at 3 percent, we are basically paying them $130 for that loan (keeping it simple, not compounded).
Think of it this way, for every dollar China spends on US debt, they are raising demand of the dollar and increasing it's value. Also, that dollar is being circulated in the US, creating jobs (increasing demand for labor raises wages and tax revenue, and ultimately the ability to pay back that debt with profit left over).
Even when the government commits wasteful spending they are creating private profit and jobs.
I would cite regulation, but I know you will simply ignore it.
