A study of the 1832 Reform Act and its significance to the modern British state. The 1832 Reform Act was a landmark moment in the development of modern British politics. By overhauling the country's ancient representative system, the legislation reshaped constitutional arrangements at Westminster, reinvigorated political relationships between the center and the provinces, and established the political structures and precedents that both shaped and hindered Britain's slow lurch towards democracy by 1928. Mapping the State leads to a fundamental rethinking of the 1832 Reform Act by demonstrating how boundary reform and the reconstruction of England's electoral map by the little-known 1831-1832 boundary commission underpinned this turning point in the development of the British political nation. Eschewing traditional approaches to the 1832 Reform Act, it draws from a significant new archival discovery shy; shy;--the working papers of the boundary commission--and a range of innovative quantitative techniques to provide a major reassessment of why and how the 1832 Reform Act passed, its impact on reformed politics both at Westminster and in the constituencies, and its significance to the expansion of the modern British state.