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State legislatures are tasked with drawing state and federal districts and administering election law, among many other responsibilities. Yet state legislatures are themselves gerrymandered. This book examines how, why, and with what consequences, drawing on an original dataset of ninety-five state legislative maps from before and after 2011 redistricting. Identifying the institutional, political, and geographic determinants of gerrymandering, the authors find that Republican gerrymandering increased dramatically after the 2011 redistricting and bias was most extreme in states with racial segregation where Republicans drew the maps. This bias has had long-term consequences. For instance, states with the most extreme Republican gerrymandering were more likely to pass laws that restricted voting rights and undermined public health, and they were less likely to respond to COVID-19. The authors examine the implications for American democracy and for the balance of power between federal and state government; they also offer empirically grounded recommendations for reform.

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This version is available at https://strathprints.strath.ac.uk/55346/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. ) challenges us to find a standard for partisan gerrymandering that is judicially discernable and manageable. Without such a standard even the most egregious partisan gerrymanders cannot be effectively challenged. However, we argue that the way to find a suitable standard is not to embark on a quest for a "new" standard. Rather it is to take the existing valid measures that science gives us, and show that these can be grounded in constitutionally protected rights. Using recent results in social choice theory, we show that the existing partisan symmetry standard can be derived from an individual right to equal protection. We also show that the existing technology for measuring partisan symmetry can provide a judicially manageable test for partisan bias.1

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