Which country is considered to be the 'opponent' of USA and why?

Thank you for not using the 'E' word!

Economically - China

Technologicaly - Japan

Politically, America is not a very popular country in the world. This problem of America's unpopularity is further exacerbated by the ugly manners that annoying and self-righteous American tourists display when they're traveling abroad.

Athletically, American people are not known for their athleticism. far from it. They're actually known for being the fattest country in the world. it shows in many international tournaments. American athleticism is nothing compared to the rest of the world. American athletes just get fatter paychecks. which in turn makes them extravagant.

Economically, China is becoming the country with the largest economy. Almost everything has a 'Made in China'. America is progressively becoming less self-sufficent. We are relying to much on exports.

these exports need money and oil to be brought from other countries. emissions contribute to global warming. If we keep going at this rate we will destroy our earth.

Americans take everything for granted and still need to wake up to the realities of life outside their little world of entertainment.

it doesn't look good for the U.S.A., does it?

Your question doesn't make any sense, but Iran, China, Russia,Osama Bin Laden are considered enemies of the USA. Here in the American continent: Fidel Castro(almost, bye bye),Hugo Chavez, Ortega,Evo Morales, and the Ecuadorian individual(that I can't remember his name).

Economically - Japan, China, European Union, Korea and ASEAN and may be India in the long run

Because they are comming up strong and taking global leadrship in business away from USA

China, for economy and mass. Everything big in the US is/will be bought by Chinese company in China (e.g. part of IBM).