Why did Cartier's men cause trouble with the Iroquois?

Cartier's men caused trouble with the Iroquois primarily due to competition over fur trade and territorial claims. Cartier's exploration and claims in North America encroached on Iroquois lands, leading to tensions. Additionally, misunderstandings and cultural differences exacerbated conflicts, as Cartier's men sought to establish trade relations while the Iroquois viewed these actions as threats to their sovereignty and resources. This friction ultimately contributed to hostilities between the two groups.