Im currently putting together a timeline where im hoping to have Spain and Portugal united in a federal constitutional monarchy. Is there any chance of this happening anytime after the 1860s which is when my POD is. Im hoping to have a nation called the Kingdom of Iberia so I was thinking that Spain could somehow get Portugal in a personal union but im just not sure how this would happen. Also if this did happen, how would the citizens of Spain and Portugal react (I know republicans, communists, socialists and fascists were quite prominent during this time)? What were Spanish-Portuguese relations like in the late 19th century/early 20th century? Would the union be able to last to the present day?