What were the motives and methods of the Iberians who sailed to the new world and the indigenous people that greeted and fought them

The Iberian in the New World motives were economic, religious and political expansion.

Explanation:

The discovery of the New World by Christopher Columbus led Spain and Portugal rush to South America. The Iberians (Spaniard) who sailed to the New World were conquistador and soldiers. The reason for the arrival was to gain wealth and land for the crown. Spanish behaved harsher to the Native Americans.

Spanish conquistador lead expeditions which helped them to conquer ancient empire (Inca, Aztec, and Maya) by killing thousands in war. The native Indians also died getting exposed to diseases like measles, smallpox, malaria, typhus, cholera, etc.

The Spanish colonies behaved brutally towards Natives as they conducted surprise attacks and used alliance with powerful tribes to defeat others.