Kansas Lecompton constitution interchangeable parts free labor ideology labor strikes working conditions Preston Brooks Charles Sumner "Crimes Against Kansas" Republican Party American Party "Freeport Doctrine" border ruffians "Bleeding Kansas" immigrants mass production Pottawatomie Creek John Brown Lincoln-Douglas debates of 1858 Dred Scott decision cotton Black Republicans exportation of agricultural goods Abraham Lincoln foreign-born voters Panic of 1857 racial equality sectional party