Long Cycle Theory

A superpower is a state with the first rank in the international system and the ability to influence events and project power on a worldwide scale. The superpower is considered the higher level of power. The United States is consider the only remaining superpower.
However, there is a theory called the Long Cycle Theory that holds that a dominant state loses power after a century, and that a war is then necessary to allow the next dominant state to achieve its position.
Do you think that the United States can be replaced by another country? Which country do you think will replace the U.S.? And for how long do you think that the United States is going to remain being superpower?