It was one thing to contain the Soviet Union in Europe because Britain, France, and Germany were all willing to join in. But will Japan and other Asian countries be willing to join in the containment of China?
The West hasn't reached its universal state as yet, although its close to it, but it certainly has evolved out of its warring state phase, which it was in for a couple of centuries.
In 1920, the West ruled huge amounts of the world.
The British were white, English, and Protestant, just as we were. They had to have some other basis on which to justify independence, and happily they were able to formulate the inalienable truths set forth in the Declaration.
Partial truths or half-truths are often more insidious than total falsehoods.
It was this society and culture that among other things - including economic opportunities here and repression in Europe - attracted subsequent generations of immigrants to this country.
