How and why did native americans participate in the american revolution

Native Americans participate in the American revolution because they need to protect their own interest in their lands. In majority they chose and fought for the Loyalist side in fighting the American revolution war.  

Explanation:  

Because America was being disputed by these two sides. Then, the native Americans needed to choose a side to fight for. They knew that choosing the losing cause will generate an important impact to their problems.  

The most of the native Americans (Cherokees, Creeks, Iroquois) chose the British side in the American revolution. As they had a previous conflict with the united states. They sought to support the British in a quest for freedom of the American side for the conflict.