China's global economic domination
You're having a laugh, right?
People claimed Japan was going to do that in the 1970s, fell apart. China faces the same problems in greater measure - ageing population; lack of infrastructure and rising wages as system cannot catch up; price of external raw resources.
Similarly India is postulated as the next great power - but the same issues are arising.
Don't right off the 21st century as that of the USA just yet.
*I can paste various links if people are to lazy to do their own research...