Your answer is B hoped i helped
The indirect clause states something that is not well know
The Choctaw Native Americans hoped they would be able to keep their land because of the "Indian Removal Act," authorized by President Andrew Jackson on May 28th, 1830. It said that, "Lands west of the Mississippi in exchange for Indian lands within the existing state borders."
https://www.loc.gov/rr/program/bib/ourdocs/Indian.html
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