What was Tecumseh's main goal in working with the British

To join with his American allies & defeat the Britishto explore the Louisiana Territoryto unite the American Indian tribes into one great nation & fight against America to give America all of the Native American land

Tecumseh’s main goal in working with the British was " to protect American Indian lands from white settlement," since the British seemed like the "lesser of two evils" when it came to Native Rights.