Electoral Systems in the Americas, 1900-2021

This dataset tracks the evolution of electoral systems in 20 Latin American countries plus the United States, focusing on the lower house of each country to allow for the comparison between unicameral and bicameral systems. The file contains detailed information on electoral formulas, tiers, types of lists, and district magnitude. It also includes two novel indices capturing the Potential for Proportionality and the Potential for Personal Vote generated by the electoral rules for the lower house.

本数据集追踪了20个拉丁美洲国家及美国的选举制度演进历程，以各国众议院为研究对象，以实现一院制与两院制选举制度的对比分析。该数据集文件包含选举公式、选举层级、名单类型以及选区规模的详细信息。此外，该数据集还纳入了两项创新性指数，分别用以衡量众议院选举规则所催生的比例代表潜力（Potential for Proportionality）与个人选票潜力（Potential for Personal Vote）。