The phrase 'Young America' connoted territorial and commercial expansion in the antebellum United States. During the years leading up to the Civil War, it permeated various parts of the Democratic party, producing new perspectives in the realms of economics, foreign policy, and constitutionalism. Led by figures such as Senator Stephen A. Douglas of Illinois and editor John L. O'Sullivan of New York, Young America Democrats gained power during the late 1840s and early 1850s. They challenged a variety of orthodox Jacksonian assumptions, influencing both the nation's foreign policy and its domestic politics. This 2007 book offers an exclusively political history of Young America's impact on the Democratic Party, complementing existing studies of the literary and cultural dimensions of this group. This close look at the Young America Democracy sheds light on the political realignments of the 1850s and the coming of the Civil War, in addition to showcasing the origins of America's longest existing political party.-Trained as an historian of nineteenth-century America, Dr. Eyal joined the Graduate School as its inaugural Director of Graduate Studies in 2015. He has served as a history professor and published a book and numerous articles and reviews on the politics of Jacksonian and Civil War America. An award-winning educator, he has taught undergraduate and graduate courses on the American Revolution, the Civil War and Reconstruction and topics in American political and intellectual history.