All of the ways to make a map of the United States with four colors

Neil Freeman, 2010-11
mapping (edition of 19,468,490,047,488)

This is one of nineteen trillion simple maps of the United States. This page will show a different map the next time loaded.

A well-known theorem proves that with only four colors, any simple map of can be drawn so that no color touches itself. The next step is to ask how many ways there are to accomplish this simple task. For the contiguous United States, there are over nineteen trillion different maps that use only four colors. Even the tightest constraints can yield near-infinite variety.