To keep it simple.
America makes 11,000 dollars p.a.
Taxes are 3,000 dollars p.a.
Government spends 4,000 dollars p.a.
So Government creates 1,000 dollars debt but creates jobs etc with that extra spending.
And so the years go by...
Current debt is 10,000 dollars which needs to be paid back....but Government is STILL overspending to maintain the status quo and keep everyone happy, but its an illusion.
At some point soon, the Government will be unable to keep spending money it simply does not have.
They are spending that cash just like the socialists.
When crunch time comes you get either mass unemployment or tax increases, whichever is the easier political medicine to swallow.
America is an amazing economy, but its not indestructible.