In this video, a geographer discusses maps that depict earth. He notes that border controls are a recent construct – there was a time when people were free to immigrate wherever they wanted without passports.
Source: Danny Dorling, https://www.ted.com/talks/danny_dorling_maps_that_show_us_who_we_are_not_just_where_we_are?language=en This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.