As Roadracer has noted, war has historically been a mechanism to distract the populace from other problems, and keep the elite in power.
In addition to China’s economic ponzi, which is far worse than anything in the Western world, pollution and industrialization has rendered China unable to feed their own population. They have severe shortages of clean water, massive desertification, and pollution that is off the charts. They need land and resources. Only the US stands in their way of having their way around the world. WWIII is becoming increasing less farfetched.