Why wasn't Portugal conquered by Spain?

Help support the channel and get a 30-day free trial with CuriosityStream with the code 'knowledgia' at http://go.thoughtleaders.io/1777320200309 to get unlimited access to the world’s top documentaries.Why wasn't Portugal conquered by Spain?♦Consider to Support the Channel of Patreon and gain cool stuff: https://www.patreon.com/Knowledgia♦Please consider to SUBSCRIBE : https://goo.gl/YJNqek♦Narrated by: Royal Carter♦Music Used : Kevin MacLeod - Drums of the Deep Kevin MacLeod - BTS PrologNomadic Sunset by Alexander Nakarada @ SerpentSound Studios Lord, Have Mercie by Karstenholymolyhttps://www.youtube.com/watch?v=XnYh2ZaiLdE♦Sources :Parker, Geoffrey - The Spanish ArmadaStanley G. Payne - A History of Spain and PortugalÁlvarez Palenzuela, Vicente Ángel. "La guerra civil castellana y el enfrentamiento con Portugal (1475–1479)"Gerli, E. Michael - Medieval Iberia#History #Documentary