Actually simply said, it is because, alot of other countries
have confidence in the US dollar, and are also tied to the US
economy in terms of investments, money, infrastructure,
defence...(and it goes on and on)...
When a country is in debt, only confidence in their currency and
economy will keep it going. That is why, when the US gives away
bonds to other countries...(bonds are like loans)...other countries
willingly take it...
But there will be a time...And i think it's VERY soon, where this
debt will catch up with the US. And most likely, we wil haev the
next BIG depression in the US economy...and the world....
So much for doomsaying...But hey, that deficit is huge...