What motivation would native american tribes have had for forging alliances with the british during the colonial war for independence?

They would be motivated by the promise of safety. They would have formed alliances with the British during the colonial war for independence if they knew that they people would not be harmed or killed by the british. They would also have been motivated by resources such as weapons, food, and tools. Their alliance could have been mutually beneficial.

Hoped he would accept their demands and end the violence

Treated as a slave is cruel and harsh