Geographical Research on the Historical Administrative Areas of Bashu In chronological order, this whole book traces the political area and evolution of the Southwest Region from the Bashu period up until to 1950s , reflecting the basic appearance, evolution and development of Bashu and its surrounding areas in the historical development process. The changes of structure, boundary, and size of political districts are shown, and other laws are explored, and the corresponding maps and photos of the former sites (relics) of the administrative districts are attached to make this study as two-dimensional as possible.