First of all, America is not a nation it's a continent. Second, if the USA was a failed nation then you wouldn't have to ask because it wouldn't fail all alone. Many other nation's success is bootstrapped off the USA's economy. A better question would be: "Where is the USA located on the civilization bell curve." I think it would be somewhere near the top but not over the crest.
United States of Mexico: called Mexico
United States of Britain: called Britain
United States of America: Don't dare calling it America
Most of Americans are recognising themself like a nation
Thay are totally not aware that thay are from Europe Africa etc
propably many maxicans will tell you i am mexican but never european americain
Ignorance between most of American citzens is high like Himalaya
Now thay even want to choose the biggest ignorant to be his leader
Thay like to be biggest ,biggest than others