Answer:
The Iroquois sided with the British because their enemy, the Algonquin, had sided with the French.
The Algonquin sided with the British because they had already established lucrative trade relationships with the British settlers.
The Algonquin sided with the British because they were fighting their enemy, the Iroquois.
The Iroquois sided with the British because the British had made many efforts to integrate into Iroquois culture and society.