Title: Why the US Dollar Is the World Currency
Headings: 
World Economy Trade Policy
Why the US Dollar Is the Global Currency
The U.S. Dollar Is the Strongest World Currency
Why the Dollar Is the Global Currency
Calls for a One World Currency
The Bottom Line
Article Sources

Content: Governments acquire currencies from their international transactions. They also receive them from domestic businesses and travelers who redeem them for local currencies. Some governments invest their reserves in foreign currencies. China and Japan deliberately buy the currencies of their main export partners. The United States is the largest export partner in China, and second largest in Japan. 7 8 They try to keep their currencies cheaper in comparison so their exports are competitively priced. Why the Dollar Is the Global Currency
The 1944 Bretton Woods agreement kickstarted the dollar into its current position. Before then, most countries were on the gold standard . Their governments promised to redeem their currencies for their value in gold upon demand. The world's developed countries met at Bretton Woods, New Hampshire, to peg the exchange rate for all currencies to the U.S. dollar.