If you want to learn about history, you have a plethora of resources. Oral traditions, written texts, and material objects all reveal historical facts, as do maps. US history maps, going all the way back to before the United States even existed, give insights into the people, events, and trends that have defined the North American continent and the American nation.
Maps can contain demographic information. They may also reflect the establishment of boundaries, redefined borders, or changing physical features. Some US maps incorporate economic, cultural, and political content, all of which reveal some of the most significant moments and changes in US history. Maps may also remind viewers of something from the past that, in hindsight, looks like a mistake, perhaps imparting a lesson for the future.