It's a very promising AH. 
I agree with the initial premise of Viriato. To achieve establish a Spanish Maghreb, Charles IV can't sell in 1792 the Spanish possessions of Mazalquivir and Oran. After the Peninsular War, Ferdinand VII could send a squad of punishment against the pirate fleet of Algiers, finally decides to take the city (in OTL 1816, Algiers was bombarded by a British squadron under Lord Exmouth, assisted by Dutch men-of-war, destroying the corsair fleet harboured in Algiers. Perhaps this attack could become a Spanish-British expedition, under the premise of definitely stop Barbary piracy in the Western Mediterranean, and after the departure of British forces, the Spanish troops manage to conquer Algiers).
If finally occurs the emancipation of Spanish America as actually happened (especially if the Revolt of 1820 occurs, because that meant that no new troops arrived to fight against Bolivar and San Martin's separatists and New Spain's royalists had chosen go against the regime that dominated the peninsula; without ignoring the possibility that this liberal proposal is made by Spaniards from Europe and America to offer the Spanish crown to Pedro I of Brazil and try to unify the two global empires in a single nation, Iberia, surely after a commitment by wedding of future Pedro II of Brazil and the future Isabella II of Spain), Ferdinand VII could try to make up by colonizing North Africa campaign
During the first half of the nineteenth century, Spain was devoted to conquer Algeria, and when it would definitely controlled, Spain cause some small incident to conquer Morocco and Tunisia (the conquest of Morocco probably begin in 1859-1860 while Tunisia would be conquered after a Spanish claim about a Tunisian incursion into Algerian territory around 1870-1880, before the newly unified Italy can obtain sufficient resources to try to colonize Tunisia). Thus, a single power would control the Atlas mountains.
During the Berlin Conference (1884-1885), Spain would defend its aspirations on Western Sahara, Mauritania and northern Mali territory (OTL Malian regions of Gao, Kidal and Timbuktu) for Spanish Maghreb (Mauritania was about to be a Spanish colony, but the then leader of the Spanish liberals, Sagasta, did brisk business personal with some French businessmen and when there was the Berlin Conference, he managed to convince the Spanish diplomats not to put pressure on those claims during negotiations through bribes and perks); whereas it would claim its old rights over the territory between the delta of the Niger River and the river Ogooue and can get all of the current states of Equatorial Guinea and Gabon, and much of Nigeria, Cameroon and the Congo-Brazzaville (by the way, to differentiate themselves from other colonies, I advocate that the territory of Equatorial Africa be called Gabon).
Regarding decolonization, what will happen will happen, I think Spain (neither the government nor the population) never raise the possibility of decolonizing the Maghreb, due to the large Spanish population settled there and great proximity to the mainland (it could avoid the second and third Carlist wars if the liberal Spanish government can direct the ultra-catholic anger of the Carlists toward the conquest of the Maghreb, claiming a new Reconquista; while the liberal Spanish government could prevent migration to foreign territories, restricting it to Cuba, Puerto Rico, Philippines, Maghreb and Equatorial Africa). This one could argue from the rebirth of a multicultural Spain, as given in times of Al-Andalus (with a possible international campaign for Sephardim be granted the Spanish nationality and again unto Spanish territory); until a strong campaign of assimilation and deportation of Maghrebian people (the Spanish government could encourage the division of Maghrebians, to proclaim that the Berbers are some kind of native Spaniards settled in the Maghreb while attacking Arab Maghrebi, who could be deported en masse to the huge colony of Spanish Equatorial Africa). Spain could also decide not to decolonize the island of Fernando Poo (Bioko) in case there was a large European population settled there.
I agree with the initial premise of Viriato. To achieve establish a Spanish Maghreb, Charles IV can't sell in 1792 the Spanish possessions of Mazalquivir and Oran. After the Peninsular War, Ferdinand VII could send a squad of punishment against the pirate fleet of Algiers, finally decides to take the city (in OTL 1816, Algiers was bombarded by a British squadron under Lord Exmouth, assisted by Dutch men-of-war, destroying the corsair fleet harboured in Algiers. Perhaps this attack could become a Spanish-British expedition, under the premise of definitely stop Barbary piracy in the Western Mediterranean, and after the departure of British forces, the Spanish troops manage to conquer Algiers).
If finally occurs the emancipation of Spanish America as actually happened (especially if the Revolt of 1820 occurs, because that meant that no new troops arrived to fight against Bolivar and San Martin's separatists and New Spain's royalists had chosen go against the regime that dominated the peninsula; without ignoring the possibility that this liberal proposal is made by Spaniards from Europe and America to offer the Spanish crown to Pedro I of Brazil and try to unify the two global empires in a single nation, Iberia, surely after a commitment by wedding of future Pedro II of Brazil and the future Isabella II of Spain), Ferdinand VII could try to make up by colonizing North Africa campaign
During the first half of the nineteenth century, Spain was devoted to conquer Algeria, and when it would definitely controlled, Spain cause some small incident to conquer Morocco and Tunisia (the conquest of Morocco probably begin in 1859-1860 while Tunisia would be conquered after a Spanish claim about a Tunisian incursion into Algerian territory around 1870-1880, before the newly unified Italy can obtain sufficient resources to try to colonize Tunisia). Thus, a single power would control the Atlas mountains.
During the Berlin Conference (1884-1885), Spain would defend its aspirations on Western Sahara, Mauritania and northern Mali territory (OTL Malian regions of Gao, Kidal and Timbuktu) for Spanish Maghreb (Mauritania was about to be a Spanish colony, but the then leader of the Spanish liberals, Sagasta, did brisk business personal with some French businessmen and when there was the Berlin Conference, he managed to convince the Spanish diplomats not to put pressure on those claims during negotiations through bribes and perks); whereas it would claim its old rights over the territory between the delta of the Niger River and the river Ogooue and can get all of the current states of Equatorial Guinea and Gabon, and much of Nigeria, Cameroon and the Congo-Brazzaville (by the way, to differentiate themselves from other colonies, I advocate that the territory of Equatorial Africa be called Gabon).
Regarding decolonization, what will happen will happen, I think Spain (neither the government nor the population) never raise the possibility of decolonizing the Maghreb, due to the large Spanish population settled there and great proximity to the mainland (it could avoid the second and third Carlist wars if the liberal Spanish government can direct the ultra-catholic anger of the Carlists toward the conquest of the Maghreb, claiming a new Reconquista; while the liberal Spanish government could prevent migration to foreign territories, restricting it to Cuba, Puerto Rico, Philippines, Maghreb and Equatorial Africa). This one could argue from the rebirth of a multicultural Spain, as given in times of Al-Andalus (with a possible international campaign for Sephardim be granted the Spanish nationality and again unto Spanish territory); until a strong campaign of assimilation and deportation of Maghrebian people (the Spanish government could encourage the division of Maghrebians, to proclaim that the Berbers are some kind of native Spaniards settled in the Maghreb while attacking Arab Maghrebi, who could be deported en masse to the huge colony of Spanish Equatorial Africa). Spain could also decide not to decolonize the island of Fernando Poo (Bioko) in case there was a large European population settled there.
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