>China will soon be more aggressive as any other empires.

in its entire history it has never invaded outside its traditional borders, and it achieved all this without invading or enslaving people. It will continue this way in future too :)

> Slavery in China has taken various forms throughout history. Slavery was nominally abolished in 1910,[1][2][3] although the practice continued until at least 1949.[4] The Chinese term for slave (nuli) can also be roughly translated into 'debtor', 'dependent', or 'subject'. Despite a few attempts to ban it, slavery existed continuously throughout pre-modern China, sometimes serving a key role in politics, economics, and historical events.

https://en.wikipedia.org/wiki/Slavery_in_China

https://en.wikipedia.org/wiki/Territorial_disputes_of_the_Pe...

> it has never invaded outside its traditional borders

Your notion of "traditional borders" is where this becomes nonsense. With a little bit of revisionist history you can justify all sorts of invasions, such as the 1959 invasion of Tibet, or the desire to retake Taiwan. In reality, China is an empire, with several of its regions very unhappy to part of it (Tibet, Xinjiang, and probably more if you could only ask its people).