YOU'R MAMA visited the court of kublai khan
I think that maybe people are saying different answers because there might have been many such laws. I will mention one example: the Diversity Visa Immigration: it means that people from Eastern Europe have a higher change of obtaining a visa due to a smaller population in the US than the western European Countries.
Answer:
1. To defend Christianity & 3. For riches
Explanation:
During the Middle Ages (medieval time) the Crusades came up as 'expeditions' to recover holy land taken by Muslims.
People involved on Crusades were seeking the security of the Church and their holy territories.
Men also took this opportunity to gain more resources and power from lands they were recovering. While promoting Christianity as the main and only religion to follow.