These boldly argued essays describe and analyze key developments in American politics and government in an era when political parties commanded mass loyalties and wielded unprecedented power over government affairs. McCormick follows the major parties from their emergence in the 1820s and 1830s to their transformation almost a century later, discussing the nature of governance, clarifying economic policies of promotion, distribution, and (later) regulation that characterized government functions at every level, and sorting out the complex relationships between politics and policy during the "party period."