So, if say, during the War of Castillian Sucession, Portugal and Castille entered an union, and remained so, eventually forming the Kingdom of Spain ( while Navarre and Aragon remaining out of it ), what would be the consequences? a) What would be the official language today? Today in that area we have- Portuguese-Galician speakers 13 mil, Castillaian speakers about 23 mil. b) what would be the capital? Lisbon- because of the overseas trade and explorations or maybe Toledo or some other like Valladolid etc.? c) colonial expansion? Would they reject Columbus as in OTL? Who would he work for? Wold they end up with whole OTL Latin America? d) What would be the relations between Portuguese and Castillians in that union? Who would have the upper hand? Would Portuguese want to separate like Catalonians today? e) I presume that Moors in Grenade are toast by the POD? f) I presume that Portuguese will allow Castillians to settle in their colonies, being the smaller part of the union and lacking the manpower?