The reasons that the Iroquois joined forces with the British are:
- They were enemies with some other tribes who were fighting with the French.
- They had long traded with British fur traders and didn’t want to upset the relationship.
The Iroquois had historical rivalries with tribes allied with the French and sought to maintain beneficial trade relationships with the British. The option about joining forces with the Algonquins and Hurons does not align with the Iroquois' choice, as those tribes were generally allied with the French.