Based on the text, what is the next superpower country?

Context: Currently, only the United States fulfills the criteria to be considered a superpower. However, the United States is no longer the only uncontested foremost superpower and the world's sole hyperpower to dominate in every domain.

Since the 1990s, China, the European Union, India, and Russia have been commonly described as potential superpowers. Japan was formerly considered a potential superpower due to its high economic growth. However, its status as a potential superpower has eroded since the 1990s due to an aging population and economic stagnation.

Answer: Given the text is difficult to tell what is the next superpower country, but the text mentions China, the European Union, India and Russia as potential candidates.