One of a maps first set of purposes was to show troop movement and or territorial boundaries during ancient times. The would show the land owned by a King or nobleman and sometimes those very same maps would cause a dispute which resulted in war. Check out this article on how Google Maps and other map applications change the boundaries based upon a person IP address or geographical location. Talk about political correctness.
Here is a portion of the article:
Some of the biggest geopolitical events in the world are centered around disputed territories, land whose sovereignty is claimed by more than one nation / occupying power.
At the other extreme, some territorial disputes involve land that would seem entirely worthless. The U.K., Iceland, and Denmark all assert ownership of Rockall Island, an 8,000 square foot rock in the middle of the North Atlantic, hundreds of miles from the nearest inhabited location.
From one extreme to the other, at least 124 countries (or “would-be” countries) are involved in a territorial dispute of some kind, involving, by my count, 105 separate territories.