Cite (in chicago style) two primary sources you find, either linked to your course or on the internet, and two secondary sources. describe why a historian would use the primary sources you have chosen; what kind of arguments could be supported with these sources.

w/o knowing wat course it is, here are two primary sources; both are speeches by Lincoln against slavery:

1. Lincoln, Abraham, "Peoria speech" delivered in Peoria, Illinois, October 16, 1854

2. Lincoln, Abraham, "Cooper Union speech" delivered at Cooper Union, New York City, New York, February 27, 1860

secondary sources were news article at the time or historian review of the speeches:

1. Horace White, "Lincoln Among His Friends", New York Evening Post, February 12, 1909, p. 170

2. Harold Holzer. "The Speech That Made The Man", AmericanHeritage.com (American Heritage Magazin. Winter 2010. Volume 59, Issue 4)

Primary sources give direct reference to what Lincoln had said and his arguments against slavery.

first paragraph (and busy all the night ,with a silence deep and white )

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