On the U.S. GeoHistoGram, the relative importance of different regions of the country is shown by the size of five colored areas. "Relative Importance" is defined as a combination of population, economic power, and political clout at any given time in history.

The basic make-up of the GeoHistoGram uses the brains natural tendencies to organize knowledge in a space-time context which helps students out information in context. Each time a student adds something to the diagram in reinforces the knowledge that has already been entered, by providing both a visual review and another set of links to help solidify the memory.