1) Europeans were interested in finding trade routes to Asia after Marco Polo's travels to China in the late 13th century.
2) In the 1450s, the Portuguese developed new sailing technologies like the caravel that allowed them to explore along the west coast of Africa.
3) Columbus received funding from Spain in 1492 to sail west to reach Asia, but instead discovered the Americas, opening the door for widespread exploration and colonization of the new world by Europeans over subsequent centuries.