Don’t go too far in other direction. Culture connections are still very important. And cross-Strait economic ties are burgeoning, which feeds into Mary and SUD’s points about trade power.
Also, the rebuilding of Taiwan is more complicated than you portray. First off, the U.S. only took an indirect hand in rebuilding the island, which wasn’t damaged all that much anyway from WWII. Mostly, the U.S. gave money to the KMT, who did some not so nice things with it (the 2/28 massacre readily comes to mind). Incidentaly, while yes, the KMT did a better job eventually of economic development in Taiwan, while on the Mainland, they did horribly, which is a large part of the reason they were defeated in 1947. Moreover, I am reading into your comments a bit, so correct me if I’m wrong, but the China versus Taiwan economic development case is not one of Communism versus traditional liberal development policy. Rather, it’s best thought of as import substitution versus developing export-oriented industries.