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Imagine a alternative history scenario in which there is no protestant reformation and the spanish empire "fix" their economy, and began to expand into asia, first by taking some islands like borneu and Peleliu, then maybe advance into Vietnam, Thailand and finally decide to invade Japan

How would be this "uber" spanish invasion of Japan? And if they succed, how much time would it take to crush the power of the clans and convert them to christianity?
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