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the united states
the united states is the current leading world power
United states
When WWI broke out the United States decided to remained neutral for two and half years, until April 1917.
united states
United States
United States became world power
The United States and the Russian Empire.
As far as political power goes, the United States is. As far as economy, it could either be the United States, or perhaps China.
It has the most leverage and power so it calls the shots on this planet. The United States is considered to be the most powerful nation politically in the world.
The result of the Spanish/American War helped the United States become a world power by letting other countries know that the United States was not going to back down. Other countries did not want to start a conflict with the United States after this war.
It is most likely a country that has put a huge footprint on the world, and it really comes down to two countries: The United States and the United Kingdom. The United States is most known for its power and involvement in world affairs. The United Kingdom is most known for its power and major empire.