The concept of gerrymander refers to: (a) legislation passed in southern states to limit ethnic participation in elections (b) the drawing of congressional district boundaries lines for the purpose of obtaining partisan factional advantage (c) an informal rule in the senate allowing senators to discuss topics not pertaining to the bill being debated (d) trading votes in order to gain support for legislation

- "schenck v. united states, case in which the u.s. supreme court ruled on march 3, 1919, that the freedom of speech protection afforded in the u.s. constitution's first amendment could be restricted if the words spoken or printed represented to society a “clear and present danger.” "

- speech aimed to potentially create danger could be banned.

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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