The coalition of former Whigs, African Americans, newcomers from the North and a few former Democrats composed the Republican in the South. Republican policies in the South emphasized modernizing and democratizing southern institutions which gathers support from many small southern farmers because they didn't have much economic opportunity in the old South.
Veterans coming out of WWI had a lot of trouble successfully integrating themselves back into society because of the shell shock they obtained from the endless fighting, disease, and death they experienced in the trenches
Steep increase of business profits due to government contracts
Because of Unicameral legislature
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The Birmingham letter I have dream and still I rise