Euro.
yes as at the time of typing this the euro will get you 1.36830 USD
Currently there is Less than 1 Euro in an American dollar because the Euro is more valuble than the Dollar.... 1.00 EURO=1.42810 USD
Euros are more then US dollar
More stable than the US dollar.
Goods exported from the US become cheaper for countries using the Euro, this then shrinks our current account deficit (importing more goods/services than we export)
yes
Euro.
Nobody. The US does not participate in it. It is for countries that are affiliated to UEFA, which are countries in Europe.
Yes a Euro is worth more than a US dollar; the exchange rate is 1 Euro = 1.34 US dollars
As of current data, countries with a higher GDP per capita than the US include Qatar, Luxembourg, Singapore, and Switzerland. It is important to note that GDP per capita measures the average economic output per person in a country.
Financially yes. Culturally no.
Monetary exchange rates throughout the world vary constantly. If a country or union is financially strong, it's money will be worth more than that of countries where the financial system may be struggling. Currently Europe is in better financial shape than the US, and that's why in 2014 the euro is worth more than the US dollar.
No, China is richer than the US because China has a much better economy.
In terms of GDP, the US is wealthier than Africa as a continent. The US has a higher GDP per capita, better infrastructure, and a more diversified economy compared to many African countries. However, Africa is rich in terms of natural resources and has the potential for economic growth in the future.
Both the population and the economy of the US are roughly ten times as large as that of Canada. Individual Canadians are on average about as rich as individual Americans. The two countries are very similar in most respects.
No currency is the currency for most European countries. There are over 50 countries in Europe. 18 of them use the Euro, but most use other currencies. So the Euro is the most common currency, but it is not used by most European countries.