Will the Interactive Map be set for a specific time period like the MapChart maps, will it be a universal one for multiple time periods, like if you hover over a nation it will show the name, years of existence, and description, or will it depict different years via a slider like MapChart's Cold War and US Historical maps?
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Maybe try adjusting it to be more like one of these:
https://historicalmapchart.net/world-cold-war.html
https://historicalmapchart.net/usa-historical.html
They are a bit easier to navigate.