Due to centuries of constant conflict, warfare and daily life in the Iberian Peninsula were interlinked. Small, lightly equipped armies were maintained at all times. The near-constant state of war resulted in a need for maritime experience, ship technology, power, and organization. This led the Crowns of Aragon, Portugal, and later Castile, to put their efforts into the sea.
Due to geography, Iberian countries had greater access to the sea than did much of Europe; this allowed the Iberian kingdoms to become a people of mariners and traders. These people had the motivation to move; they were close to the wealth of Africa and the Mediterranean. Expansion and development of ship technology were due to commercial, military and religious endeavors.