How Many Colors Do You Need to Color a Map?
Investigate everything surrounding How Many Colors Do You Need to Color a Map in this comprehensive guide.
The Four color theorem states that no more than four colors are required for any map. Can it be proved or disproved that 3 colors can be used for United States map? I think this is a question of geometry. – Brian J. Fink May 18 ’14 at 22:38 Note that 4 colors may not suffice if there are exclaves. I don’t know whether this is a problem for the US.