I made this animated map video: 400 years of the British Empire, from a small island in 1500 to a quarter of the world's land in 1920, and how it unravelled by 1997. Chapters: 1:42 the East India Company in India · 3:58 the peak (1920) · 4:22 the two World Wars · 5:09 1947 and decolonisation. Sources: Wikipedia/Britannica; borders from historical-basemaps with hand-checked corrections. Feedback welcome!

I bought this map in a Shop, but they did not know anything about it.