This article examines the relationships among several political phenom
ena that have characterized American politics during the post-Second W
orld War era: Republican success in presidential politics, Democratic
success in controlling the House of Representatives, and the political
mobilization of African-American citizens. We argue that the logic of
federalism and single-member districts, combined with geographically
concentrated distributions of racial and ethnic groups, has rendered a
spatially complex political terrain. In some parts of that terrain, r
ace does not impinge on electoral politics but in other parts, politic
s revolves around race. And thus both parties' electoral fortunes are
tied to coalitional constraints that, are associated with particular l
ocales, producing varying consequences for congressional and president
ial elections. The empirical focus of our paper is on individual voter
s in presidential elections from 1952 to 1988, and in off-year congres
sional elections from 1958 to 1986. We are particularly concerned with
the local political environments of coalition formation, and thus we
engage in a multilevel analysis of voters in counties, located within
particular regions.