China obviously. They have unlimited manpower, technologies, and the nuclear bomb.

Since they have no souls either, I say they got what it takes to take over the world.

Who says there needs to be a superpower.

History doesn't go in full circles. Americas power is being matched by others and economically it isn't going the right direction. Meanwhile Russia has no powerful friends which it really needs and china doesn't have an imperial mindset like previous superpowers. Also china's growth now isn't gonna last with its current economic model.

Japan isn't going to be a superpower anytime soon, just like India. The European Union is on the brink of major changes so its future is unsure.

This all forgetting the importance of possession of the atomic bomb.