PNP249317 Map of the United States of America, depicting the slave states and free states, 1821 (colour litho) by American School, (19th century); Private Collection; (add.info.: slave territories in the south; agreement between the pro-slavery and anti-slavery factions; regulation of slavery in the western states; abolitionist states in the north; compromise was repealed by the Kansas-Nebraska Act of 1854;); Peter Newark American Pictures; American, out of copyright.