books.google.ca - During the 1840s and 1850s, a dangerous ferment afflicted the North-South border region, pitting the slave states of Maryland, Virginia, Kentucky, and Missouri against the free states of New Jersey, Pennsylvania, Ohio, Indiana, and Illinois. Aspects of this struggle--the underground railroad, enforcement...http://books.google.ca/books/about/Border_War.html?id=_wKvp9btIvYC&utm_source=gb-gplus-shareBorder War
