1) Early European contact with the Americas began with the Vikings establishing a colony in Vinland in the 11th century, though they later abandoned it.
2) A series of developments in 15th-16th century Europe, including the Renaissance, new navigation technologies, and desire to find an eastern trade route to India, led Portugal and Spain to sponsor voyages of exploration.
3) Christopher Columbus' voyages for Spain in 1492 led to permanent European colonization, though he mistakenly thought he had reached Asia. Subsequent Spanish expeditions conquered empires of the Aztecs and Incas and claimed territory across North and South America.