Well probably by order of population, 1939, 1914, 1500, 0? I guess it depends whether people use these maps more for looking at countries subdivisions in 2020 or for historical timelines and editing them from thereAlso, what exactly did you have in mind for historical patches?
Do you have video showing that? I tried using QGIS before but it's complexI made it using QGIS and Paint.NET.
Greenland's municipalities are outdated - You forgot Qeqertalik.