Why did the U. S. dollar become a substitute for gold in international markets during the 20th century? A. The United States had threatened to cut off trade with other countries
B. The United States had the worlds largest gold reserves
C. The United States declared that the US dollar was fiat currency
D. The UNited States sold gold at the lowest prices in the world
Please only legit answers

The platt amendment of 1901 forbade cuba from entering into any treaties that would allow undue foreign involvement in cuban affairs. this law was passed after the spanish-american war to make sure that european nations weren’t going to get involved with cuba. 1, why might the platt amendment be considered ironic? 2, what reasons would the united states have for not wanting european influence in cuba?