Your answer is that the main reason is that people buy land and they needed to get money which means there really greedy people so the buy slaves and force them to work for little or no money so they can sell crops (they made the slaves become farmers) to make profit then they would buy more land and get more slaves to work as farmers on and on. So it spread because one guy did it and he made a lot money and other people wanted to do the same and that's how slavery spread through North America.
Encomienda was a system of protection. The Spanish monarch would assign a Spaniard protector of the colonies. In return, the colonies inhabitants would have to give what the monarch asked back. It could vary from food, to gold, to wood or pelts, or anything.
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By 661, Islam had spread as far north as the present-day regions of Georgia, Armenia and Azerbaijan and as far east as the eastern borders of ancient Persia (modern day Iran), even into areas of modern-day Afghanistan.
These expansions occurred under the first four caliphs of the Islamic caliphate.
Further expansion continued under the Umayyad Caliphate, from 661 to 750. By the mid-8th century, Islam had expanded as far as Spain in the west and to the Indus River in the East.
