[w1ntermute]

> They could accept, say, 20 million educated and/or wealthy immigrants from China over the next 20 years, with no shortage of takers ( http://news.ycombinator.com/item?id=2660178 ), which would strengthen America and weaken China.

This is the best way to weaken China. In fact, it's the best way to weaken any poor country. Just pay the best people they have to come to your country and become permanent citizens. It's still not too late. Within 20-25 years, there may be no advantage for them, but right now, there is still something for the Chinese to gain by moving here.

[iaskwhy]

You don't even need to pay people to move, you just need to have a better society (and get rid of all the immigration laws which prevent this from happening).