WI: Spain successfully conquers Portugal during 18th Century

I'm suspecting during the Seven Year's War as the main one. Could Spain hold on to the place? Integrate it into a centralised Bourbon Kingdom? If so, would Spain stay as a major power for longer?
 
Franco-Spanish forces can occupy the whole of mainland Portugal if there's no British help in 1762.
But it's too late to integrate Portugal in Spain. Bourbon Spain will have to annex the rest of the Portuguese empire too.
 

Lusitania

Donor
Spain could not of done the job by itself in the 18th century it was too weak both economicly and militarily. Although still stronger than Portugal. A joint French-Spanish attack might of worked but they never would of been able to integrate Portugal into Spain.

Also anytime France was involved it would surely mean British involvement.
 
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