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Tradition, and because USA is the single largest economy in the world.
The economy of EU is larger, although split up over several countries, and EU was at some point hoping that the Euro would take the place of the USD, or at least be equally common.
I saw that China recently wanted another currency that could replace the USD for international transactions, perhaps a virtual currency calculated from the currencies of the X largest countries or something similar.
But the USD has been the world currency since around World War II, it takes time to replace three generations worth of trust in a monetary system, so I guess the USD will be with us for quite a while yet.
As a side note, the Spanish dollar was the world currency in the period 1600s-1800s. These things do change, but not very quickly.
See related link on World Currencies.
What else can I help you with?
What did president Taft hoped to use to protect American intrest in cuba?
dollars for bullets
What did Americans use manifest destiny to justify?
The Mexican-American War.
How did Americans win several battles in the Mexican-American?
they made use of a large army
What currency is used in America?
In Canada they use the Canadian dollar. US Dollars
What fighting method did the Americans use on British?
The American forces used what we call today, Guerrilla warfare; which is the Native American way of fighting.
What festivals do Americans celebrate?
What are all the American dollars and coins?
Can you use a Canadian credit card to get a subscription to something like sentence?
Sure - it's the dollars behind it that they want in American dollars, the card itself doesn't matter. For Americans the $15.99 is the same 'cost' as the $17.99(?) that Canadians pay in Canadian dollars.
Why is decision support is important?
We have an obligation to use American taxpayer dollars as if they were our own
Can you use American dollars in Brazil?
yes...
What is the value of 1.00 American to Haitian dollars?
It is illegal to buy Americans, or any other people, with any currency including Haitian dollars.
What is the difference between Americans and English?
english and american currency are both different english money is the pound (£) and american money is dollars ($)
What kind of money do they use in Hawaii?
They use regular American dollars
Can you use American dollars in the Netherlands?
US dollars are generally not accepted for payment in the Netherlands.
Can is use American dollars in Singapore?
Some retailers accept US dollars though not all.
If you divide 700000000000 dollars by 200000000 Americans how much money could each person get?
3,500 for each american.
Do you need to have Bermuda dollars of can you use American dollars in Bermuda?
both bda$ and us$ is accepted in bermuda
What did president Taft hoped to use to protect American intrest in cuba?
dollars for bullets
