Before European contact, native populations across North America developed diverse social, political, and economic structures adapted to their environments. Some groups, like the Maya, Aztecs, and Incas, formed large empires with advanced agricultural systems, while others like those in North America lived in smaller, nomadic societies relying on hunting and gathering. Beginning in the 15th century, Europeans began exploring and colonizing, seeking wealth, trade, and empire. Spain claimed much of North and South America and forced native populations into oppressive systems like encomiendas, dramatically reducing their numbers through violence and disease. Debates emerged around how to classify and treat indigenous peoples.