If you dig up the Wikipedia article on Southern Illinois, they mostly identified with the White Southerners' mentality more than the Northerners on Slavery before the Civil War. Despite some prominent people from the region serving in the Knights of the Golden Circle, many of the residents served in either the Union's 31st Illinois Volunteer Infantry or 111th Illinois Voluntary Infantry during the war. Also, William Alexander Ralph served on the UNION side of the war from his Illinois draft record.
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Ralph is a Carpetbagging-Grifter confirmed here tonight.