Because Dead Pres. Nixon “opened” China to western commerce, an act which I and many others considered insane at the time, China did exactly as we expected them to. The new prosperity we gave to China resulted in many things, the decline of our own manufacturing centers along with the loss of millions of jobs, the collapse of our economy and the huge advance of the Chinese economy. By moving so much of our manufacturing over there and selling the Chinese so much of our advanced technology, they now have succeeded in building a superfast intercontinental ballistic missile that travels at 10 times the speed of sound and can maneuver in flight, and is intended solely to zip past our defenses and blow us to Hell and gone.
After all, once our economy is totally wrecked, what further use are we to them except a good place to put a lot of excess population after they kill us all off?