The tang dynasty was an interesting case of ancient globohomism and what it resulted in was violence on a scale the world has never seen and never since.
I believe something like 70% of the chinese population got wiped out
China has consistently shown that it has the capability to massacre foreigners on a mass scale without any regret. (including it's own population).
Most people don't know that Chiang Kai shek's "northern expedition" involved going around the countryside massacring foreign missionaries. It was the angry Chinaman taking his country back from foreigners.
It's interesting if America and Europe will go the same route as China.
One thing that is undeniable is that human beings are controlled by emotions. As much as they like to think otherwise with the rule of law, religion, human rights, etc... It's plasuible
If resources become scarce, you can basically throw all of that shit out the window. People, nations, and societies are only idealistic so as long as they have their very basic needs met.