US is certainly still the sole superpower. China has decades to go (or if they were willing to swallow it, a single decade of very large-scale mobilization, but that is unlikely) before they can start reaching anywhere outside of East Asia in a significant way (though they have inroads in African countries like Sudan and Angola, and retain ties to Cuba), and as others have stated, there has never really been a time when one military superpower was so far ahead of everyone else. Even in the days of British hegemony (before Bismarck or Napoleon III), though they had a lock on global naval power, they did not couple that with the kind of technological lead on their closest competitors like we have today.
Russia's military is still ahead of China's technologically, which should say something about just how far back China is, since we have a pretty fair estimate of how far back Russia is. Anyone else with competitive military technology is firmly in our bloc, and that's the end of the story
Economics is another story, but even if we in the USA can't get our shit together there, the only thing keeping China's real-estate bubble from popping is corruption and sheer willpower (e.g. the Party Men won't let the bubble pop, though it likely should have by now)
Monster Hunter: pissing me off since 2010.
