Uh, when and how? Every one was Catholic in England until Henry8. Then he and his of his new church killed those who remained Catholic. Lots came to Maryland. True asylum seekers.
Uh, when and how?
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Spanish Inquisition for a start. When the Spanish conquered the new world.
So Catholics never persecuted Protestants? I guess the Inquisitors and gentlemen like the Duke of Alba were just the Welcome Wagon?