Depending on where your research takes you, you may want to seek out state historical societies and other state-specific resources, such as museums with digitized collections. While they may not have specific information on the person you are focusing on, they could have valuable contextual information about life in that area when your person lived there.
Maps can provide important context for your work in genealogy. Indicators of natural resources, terrain, or weather can be valuable as you try to understand why people were drawn to an area, what their jobs might have been, and why they might have moved.