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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 colouring is not the only way to four-colour the map: for example, Florida could be orange.
Map of USA with Iowa highlighted: Date: see file history below. Source: own work by uploader, based on Image:Map of USA without state names.svg: Author: This version: uploader Base versions this one is derived from: originally created by en:User:Wapcaplet: Permission (Reusing this file)
Visual proof USA states map needs 4 colors: Image title: Proof without words that a map of US states needs at least 4 colors so that states sharing land borders (disregarding the quadripoint) have different colors by CMG Lee. For example, landlocked Missouri (MO) has 8 neighbors (even).
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This image is a derivative work of the following images: File:Blank_US_Map.svg licensed with Cc-by-sa-3.0-migrated, GFDL 2009-11-05T19:44:02Z NuclearVacuum 959x593 (91518 Bytes) minor fix from previous upload
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