during the cold war it was a competition between the Soviet Union and the united states
and currently it is the united states
in the future japan could be the most powerful economically
china the most powerful military wise
as America is getting weaker than it once was (in massive amounts of debt, low education standars, terrible healthcare system ect)
As of 2010, the country that is most dominant culturally, militarily, and economically is the United States of America.
The cultural influence of America eclipses that even of ancient Rome, in that virtually all countries import or imitate significant American cultural aspects, from forms of government, to institutional design, to economic planning, to (perhaps the best known) media. Incorporation of American English into local languages also far eclipses any other language's influence. Perhaps the biggest indicator of the pervasive cultural influence of America is the very vocal and (in many places) organized resistance to American culture, the stridency of which is generally proportional to the amount of influence.
Militarily, the conventional forces of the United States far outweigh those of any other current nation. The combination of size, funding, technically advanced equipment, and institutional design have provided the US with a conventional armed force more dominant that perhaps any other since at least the Mongol Empire. However, this dominance is significantly degraded by the increasing proliferation of nuclear (and other mass-destruction) weaponry, and even by the movement away from conventional warfare to asymmetric and nontraditional warfare (guerrilla and cyber/economic warfare).
Economically, the United States still is the largest world economy, and possesses a top-10 per-capita income. It retains two of the top-5 financial centers of the world, and is both the largest importer and exporter of goods and services in the world. However, this dominance has significantly declined over the past 20 years; due to both domestic problems, and world-wide growth and re-alignment, the United States will likely very soon lose its status as the dominant economy. However, the likelihood is that no country will gain dominance as the US falls - instead, global trading blocks and associations look to be the dominant economic forces, rather than single nations.
Turkey is the most powerful Islamic country. However, the US is the most powerful country in the world.
At the moment the most powerful country is America,the 3'rd most powerful country is Russia.
Greece is the most powerful country in balkans
Pakistan is the most powerful Muslim country in the world.
Many believe that running the world's most powerful country makes the president the most powerful person in the world.
most likely a prime minister of a powerful country
Japan has the most powerful economy in Asia.
The European Union is the second most powerful entity in the world after the US. Although not technically a country, the EU holds the potential to be a superpower and is even more powerful than China. The EU is expected to fuse as one country someday and its also not expected to be surpassed as the second most powerful country.
The U.S. is probably the most influential country at the moment.
The Jaguar has been rated as having the most powerful bite, at 2,000 psi
The United States
China or India