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What might be the effects on the English language if the Great Armada of 1588 (or one of the later armadas launched by Philip II) succeeded?
Of course much would depend on how a possible Spanish conquest pans out.If it is more than just a change in monarchs or a religion and the British aristocracy is replaced similar to the Norman Conquest this may have major changes in the language. John Brunner in his Times Without Number has English as a "debased language spoken in a few villages" in his AH England.
Would English be something of a Spanish English hybrid?