He was an emissary...………..
Worcester v. Georgia, 31 U.S. 515, was a landmark case in which the United States Supreme Court vacated the conviction of Samuel Worcester and held that the Georgia criminal statute that prohibited non-Native Americans from being present on Native American lands without a license from the state was unconstitutional.
They did not move west or south, according to my knowledge
This is false, it was part of the compromise of 1850