Maps that turn world history upside down

https://www.youtube.com/watch?v=UQRTRBkcN8g

The YouTube video for my Zoom lecture on May 15, 2021 will have a public premier May 22, 2021, at 9 pm USET. Asian time (mainland China, Taiwan, and Hong Kong) on May 23, at 9 am. Please let your friends know so we can all watch together. Comments are welcome.