Why did the freedmen of the south turn to carpetbaggers for help after the elections
of 1868?

White supremacist paramilitary organizations, allied with Southern Democrats, used intimidation, violence, and assassinations to repress blacks and prevent them from exercising their civil rights in elections from 1868 until the mid-1870s. The insurgent Ku Klux Klan (KKK) was formed in 1865 in Tennessee (as a backlash to defeat in the war) and quickly became a powerful secret vigilante group, with chapters across the South. The Klan initiated a campaign of intimidation directed against blacks and sympathetic whites. Their violence included vandalism and destruction of property, physical attacks and assassinations, and lynchings. Teachers who came from the North to teach freedmen were sometimes attacked or intimidated as well.

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Explanation:

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