Why are there two Chinas?

There are two Chinas in the world, so, why?
Source:
Music Credits:
China Sly 3 Theme

[sealsaregood]

The flag of the Qing Dynasty was so cool.

[hoangkimviet]

Taiwanese then: “There are indeed two Chinas. But ours is more legal than theirs.”
Taiwanese now: “Sorry, there are only China and Taiwan. They are they and we are we. We are not the same.”

[lordaaron]

Very well done! Keep up the great work! ^^

[zainiabdullah]

What 2 Chinas? Its 3 China (Singapore included)!

[schsch]

“People’s republic of china:”YOUR ME TAIWAN”
republic of china:”NO IM NOT0