The Native Americans were promised protection against the 'Americans' but the British couldn't keep that promise because, as you probably know, we were beaten and were 'kicked out' of the country.
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It hurt the Native American cause because the colonists weren't likely to give the Native Americans permission to have their land back, so them siding against the colonists ensured they weren't going to get it back. Many Native Americans were killed in the battle, so that further decreased their population after suffering a wave of disease from the settlers.
British
because the british agreed to to give up thier forts on americans territory
Squanto told the Pilgrims how to plant corn, squash, and beans. Other Indians taught the colonists about tobacco. Some served as guides and translators.
To put it bluntly Jackson felt that the only good Indian was a dead one. He built his reputation on killing native Americans and there were many who agreed with him. The US policy towards the Native Americans was one of discrimination and it was apartheid at it's very worse. The Indian Removable Act moved native people off of ancestral lands so settlers could take the land or the railroad go through. Moving people to reservations meant that they were unable hunt, and unable to live within reasonable means. It was death and Jackson was intolerant in his attitude to Native Americans.