English: A map of the United States showing four colors. According to the four color theorem, only four colors are needed to complete a map containing any type of shapes provided that two touching shapes share a border of at least two points (a line).
This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Added brighter colors, removed extraneous detail, added boxes around Hawaii & Alaska. The original can be viewed here: Map of USA four colours.svg: . Modifications made by Tomwsulcer.
{{Information |Description= A map of the United States showing four colors. According to the four color theorem, only four colors are needed to complete a map containing any type of shapes provided that two touching shapes share a border of at least tw...