Europeans arrived in the Americas in 1492 when Columbus landed in what is now the Bahamas. Europeans established plantations and used advanced weapons and diseases like smallpox to force the local populations into labor, devastating Native American populations. The exchange of animals, plants, and diseases between the Old World and New World, known as the Columbian Exchange, introduced many new goods and permanently altered global populations and trade. Spanish explorers then conquered the Aztec and Inca empires, establishing the Spanish Empire in the Americas through systems like the Encomienda that exploited local populations.