There were several instances during the Colonial or Revolutionary Era where enslaved people attempted to revolt or fight for their own independence. The first nation where a slave uprising was successful was . The
resulted in the creation of brutal slave codes that would not be lifted until after the Civil War.

slave revolt as an action involving 10 or more slaves, with “freedom as the apparent aim [and] contemporary references.

Explanation:

Aptheker says, he “has found records of approximately two hundred and fifty revolts  in 1831 when Nat Turner led a bloody uprising in Southampton County, Virginia. Turner was deeply religious, and planned his rebellion after he experienced prophetic visions.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain