>and spend those funds on beneficial projects at home?
What funds? The US is what it is because it forces the world to buy dollars.
If a European country wants to buy gas from Saudi Arabia, the deal must be done is dollars.
Why?
Because the US forces that to happen, by force.
The moment the US stops using military force outside their borders, the world does not need dollars anymore, and the US becomes way poorer, because they can not print dollars anymore.