How Many Colors Do You Need to Color a Map?

Is how Many Colors Do You Need to Color a Map a hot topic right now? Read expert findings in our dedicated article.

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.

James H. Sterling

James H. Sterling

Environmental Science & Climate Journalist

James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.

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