80% huh?
China is about 24% of global manufacturing. Their share is also no longer increasing (their manufacturing sector has been net stagnant for years, as they tread water; moving up the ladder in some sectors, while cost-sensitive manufacturing flees to cheaper shores like Vietnam).
The US is around 18% to 19% of global manufacturing (it was 28% as recently as 2002).
China took the global lead in 2010.
Other countries are also still very substantial manufacturing centers. Japan, as of 2016, for example still had a manufacturing output equal to 30% that of China (with an economy ~45% the size of China in that year).
Germany has an economy 1/5 the size of the US, but it does about 1/3 the manufacturing output of the US.
The US + Japan + Germany have a manufacturing output about 25% larger than China.
https://fas.org/sgp/crs/misc/R42135.pdf