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 Prolog Nomadic Sunset by Alexander Nakarada @ SerpentSound Studios Lord, Have Mercie by Karstenholymoly https://www.youtube.com/watch?v=XnYh2ZaiLdE ♦Sources : Parker, Geoffrey - The Spanish Armada Stanley G. Payne - A History of Spain and Portugal Álvarez Palenzuela, Vicente Ángel. "La guerra civil castellana y el enfrentamiento con Portugal (1475–1479)" Gerli, E. Michael - Medieval Iberia #History #Documentary