This book investigates the political ramifications of ethnic divisions within the United States, arguing that distinct mobility patterns of natives and immigrants, exacerbated by high levels of immigration from developing nations, are fragmenting the American electorate. James Gimpel, drawing on insights from economics, demography, sociology, political science, and anthropology, presents evidence that spatially isolated immigrant populations are less likely to naturalize and engage in political processes. This leads to significant disparities in political participation and representation across different communities. The book further analyzes state-by-state variations in the extent of this political balkanization and its differential impacts.

The book is positioned to appeal to a broad readership, including scholars, students, and policymakers, due to its interdisciplinary approach. The author's analysis of immigrant mobility and its impact on political participation suggests a focus on contemporary social and political trends. The examination of state-level variations indicates a detailed, data-driven approach to understanding the complexities of ethnic divisions in American politics. The work aims to illuminate the consequences of these divisions for representation and electoral outcomes.