Here are four videos that track the borders of Poland from the Early Middle Ages to the present day.
POGKPP is one of several Youtubers to create year by year looks at the state of Poland, starting with the year 960.
Khey Pard also created this one tracking the years 966 to 2017
Meanwhile, Ollie Bye has created a video tracking the Polish and Lithuanian states
Finally, Danzig HD Mapper has created a map showing all the states of Eastern Europe, beginning in the 8th century
You can also watch this beautifully done Animated History of Poland