The Revolutionary War with Britain after British colonists were already in the US, sent by the British. Basically, they were being taxed on stuff like Molasses and Tea. They didn't want taxation from a country in which they had no representation in government. This was the reason for the Boston Tea Party. Then of course they formed their own independent country once they were free from Britain.
Tribes such as the Algonquian, Cherokee, and Iroquois lived in the Eastern Woodlands - these woodlands are located between <span>the Atlantic Ocean and the Mississippi River</span>