Proportional representation in the United States
Proportional representation (PR) in the United States refers to the multi-winner electoral systems currently used in several cities (usually single transferable vote) and the presidential primary process for the two major political parties in the US. Cities began adopting PR in the 1910s during the Progressive Era. Historically, PR elected Black candidates in an era defined by Jim Crow laws. Since the 2010s, several electoral reform groups have advocated for the use of proportional representation to elect Congressmembers, instead of the current winner-take-all plurality system.