In the 19th century, American settlers moved West grabbing frontier lands. The term Manifest Destiny was coined, which claimed special virtues for American people. It was imperative that they fulfill this essential duty. The United States used muscle power to deprive the indigenous people of their land. Once the natives were conquered, this theory was applied to rest of the world and soon Puerto Rico, Cuba and Philippines came under American control, apparently to rescue them from Spanish tyranny. The Native Americans lost their land, traditions, and religion. They watched helplessly as a flood of settlers flocked to their land.
This asuric behavior had its origin from the crusades in the 11th century. During that time, there was a major movement of European population driven by religious fervor. They figured out how to move long distances, take control, and displace existing population. This process took a break as the continent experienced Black Death. Till the Middle Ages, Europe became an insignificant entity on the world stage with nothing of value to offer to the world. Then they embarked on a series of voyages of discovery and came upon plundering as a nation-building option.
The 20th episode of Tides of History goes into detail about this period. Much before the voyages of Columbus and Vasco da Gama, Castille, Aragon, and Portugal started expanding to other areas kickstarting the process of invasion and settlement. After Aragon conquered the Island of Majorca, in the middle of the Mediterranean, the king distributed the land among the nobles who accompanied him. Then came the settlers — Catalans, Italians, Navarrese — who took possession of the property obtained during the conquest. There was a similar movement of people all over into Hungary, Romania, Sicily, Greece.
Following the conquest of Southern Spain by Castille, the Moors slowly disappeared. They were forced or enslaved and those who stayed were converted to Christianity. They replaced rebellious leaders with leaders over whom they had control. They were familiar with the process for populating newly conquered frontier lands and enticing settlers to those new lands. This was an established process by the time Vasco da Gama set sail to India. Remember, he did not come for spices alone. He was also looking for Prester John to liberate Jerusalem.