Typically, slaves would travel from different countries on boats known as "slave ships." The quality of these ships were extremely poor, because the slaves were all crammed inside the boat. Many of the slaves would die on voyages to different countries.
The factors that motivated the Europeans to participate in a crusade is having the chance to expand and discover new lands for their empire, to gain a title and fame, to gain riches, to serve their religion and God, and because the Pope told them that if they join in the Crusade, their sins would be forgiven.
In general, the relationship that existed between the French and the Natives in North America was better than that of any relationship the Natives had with other Europeans, since many alliances and partnerships were formed (such as that one during the French and Indian War against the British).