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Your challenge is to make Taiwan a U.S. protectorate. By protectorate I mean that Taiwan would be considered a part of the U.S.'s territory but would be near completely self-governing (or it could mean that Taiwan would enter a free state association with the United States as Micronesia or the the Marshall Islands have). If it's (somehow) too easy to do this with a renegotiated Treaty of San Francisco, I'd recommend a Point of Divergence after 1979.