Sometime during the first two decades of the 20th century, the participation of the American electorate began its plummet; voter turnouts fell in each election after record heights in 1890. Kornbluh (history, Michigan State U.) examines mass political behavior in 20 successive national elections, arguing that the rapid decline of electoral participation was gradual and a result of fundamental social change, a conclusion maintained by the author to be at odds with previous literature focusing on discrete political events to explain voter demobilization. Annotation copyrighted by Book News, Inc., Portland, OR