A new Iberian Union

Luis does not seem to have been terribly active as a king, so the power would have rested with the Cortes and he would have been a figure head at best.

My feeling is that as soon as his government became unpopular then Isabella's son would have been a rallying point for rebellion and he would have been thrown out of the country.

I am assuming there would have been a personal union, rather than a more complete merging of the two countries.
 
My feeling is that as soon as his government became unpopular then Isabella's son would have been a rallying point for rebellion and he would have been thrown out of the country.

Why not the Carlists?

I am assuming there would have been a personal union, rather than a more complete merging of the two countries.

At first. But my understanding is that there was some liberal desire for an Iberian federation, so if the personal union lasts longer than, say, 50 years...
 
WI King Louis I of Portugal was offered the Spanish crown by the leaders of the Glorious Revolution and accepted it?

Probably he could lose his Portuguese throne. "Iberism" was only popular with a minor faction of the Liberals. One of the reasons why Luis' own father (Ferdinand II) refused the Spanish throne when was offered to him was exactly because he feared the political problems that it could cause. If they had offered to the king himself the public outcry would be huge.
 
Maybe he suggests his surviving brother, the Infante Augustus. Just what sort of political problems are we talking about?

Mostly populist anti-Spanish feelings among the population. It was always a popular trend in Portugal using Spain as a boogeyman, and any talk of Iberism or union of crowns (at least since after 1640) was opposed by arguments that it would mean reducing the country to a Spanis province.

The Portuguese had such a problem with this that the succession laws of their monarchs was extremely extrict in order to avoid a foreign (read it a Spanish) from taking the throne. Portuguese kings should be born in Portuguese territory, and any daughter of a monarch who had been married to a foreigner would automatically lose her rights to the throne. IIRC even only twice this probihition was annulled (when Peter II tried to marry his eldest daughter to the Duke of Savoy and when Mary II was first engaged). So, if Luis suggests his brother to the Spanish throne, it probably would only be accepted if he had to renounce to his Portuguese rights.
 
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