What causes the depreciation US dollars against foreign currencies?

Question

What causes the depreciation US dollars against foreign currencies?

Answer 1

George Bush

Answer 2

George W Bush.

Answer 3

The trade in balance. Other nations that get our dollars will  trade them for gold.euros and yen at a lower cost.Too many dollars have been paid and less money replacing it As long as we need oil and cheap goods the dollar will drop.The debt from the war will also add to the weak dollar.