A map of the United States, showing which party controls each US state upper house (and the unicameral Nebraskan legislature. Information from File:States upper house political majority.png
  Democrats
  Republicans
  Popular Democrats
  New Progressives
  Nonpartisan legislature
Vector map from Blank US Map.svg by User:Theshibboleth et.al.
Info from: File:States upper house political majority.png by Zscout370 et.al.
Synthesis: Cassowary
Version based on new map by: Lokal_Profil