Surveying critical episodes in the development of American political parties—from their formation in the 1790s to the Civil War—Aldrich shows how they serve to combat three fundamental problems of democracy: how to regulate the number of people seeking public office, how to mobilize voters, and how to achieve and maintain the majorities needed to accomplish goals once in office. Aldrich brings this innovative account up to the present by looking at the profound changes in the character of political parties since World War II, especially in light of ongoing contemporary transformations, including the rise of the Republican Party in the South, and what those changes accomplish, such as the Obama Health Care plan. Finally, offers a fuller consideration of party systems in general, especially the two-party system in the United States, and explains why this system is necessary for effective democracy.