They should have had a ‘Year’ counter in the upper left corner so you can tell what era was being shown.............
this would be fantastic learning tool if you slowed it down and annotated it to show what was occuring
As it is, you just see borders popping up and changing all over, sometimes all over the place that is hard to follow at this speed, and without context as to what was happening.
For example it might say “This is the year when Ghengis Khan ruled and expanded to ...” (”In a manner reminscent of Jenjis Khan”)