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What would it take for the entire Iberian Peninsula to be under 1 government by the end of the 20th century? The rules are that the government must control modern day Spain, Portugal, and Gibraltar, but nothing else in the European continent. The government must be centered on the Iberian Peninsula, so a Spanish empire can exist. It must me long term control, not occupying Portugal for a while and getting kicked out later. I assume that the government in charge will be Spain, but bonus points if you can make it Portugal. Plausibility is preferred, but not required. Possibility is required, no ASB's.
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