United States Senate malapportionment: A geographical investigation

This study is a geographical investigation of malapportionment in the United States Senate, using national-level tables and graphs for all census years from 1790 through 2020, and state-level maps for census years 1790, 1820, 1920, and 2020. Senate malapportionment is found to have worsened over time, with geographically varying manifestations. The article proposes an expansion of the Senate using the Method of Equal Proportions, which would considerably diminish the degree of malapportionment if adopted.