The Age of Exploration was driven by improvements in sailing technology and the policy of mercantilism. Europeans began extensively exploring and colonizing other parts of the world. Key explorers included Bartolomeu Dias, who sailed around the Cape of Good Hope; Vasco da Gama, who found the trade route to India by sea; Ferdinand Magellan, whose crew completed the first circumnavigation of the globe; Christopher Columbus, who sought a western route to Asia but found the Americas instead, launching the massive Columbian Exchange of plants, animals, and diseases between the hemispheres; and the establishment of the triangular trade route between Europe, Africa, and the Americas, which centered on the slave trade.