The US dollar is backed by the US military. This is where all their power stems from. Very few countries if any want to challenge the United States for dominance because of their immense military presence. This is why president's refuse to cut military spending.
to be able to maintain the stability of the price of the American dollar always using their military. by destroying anyone who dares to oppose the dollar. Cryptocurrency is here to be able to become an alternative currency to replace the dollar because some countries do not want to be pressured by America. so try to use alternative currencies.