contestada

Why did the U.S. dollar become significantly more valuable and influential in
the mid-20th century?
A. It was the only currency the United States used for foreign trade.
B. It was declared a type of fiat money backed by the U.S.
government
C. It was one of the only world currencies still backed by gold
reserves.
O D. It was adopted as the official currency in most countries around
the world.