Final answer:
A dot distribution map is used to show population distribution in the United States, accurately reflecting the higher population density in urban areas compared to rural ones.
Step-by-step explanation:
The type of map that has been used to show population distribution in the United States is a dot distribution map. This type of map is effective in representing the concentration of people within a given area by placing dots in locations proportional to the density of the population.
Unlike choropleth maps, which can mislead by suggesting larger rural areas are densely populated, or cartograms, which may distort geographical shapes to emphasize population, dot distribution maps provide a more precise visual of where people live.
These maps are particularly useful for noting urban concentrations, as over 75% of Americans reside in cities despite the larger land area being rural. A dot distribution map is key in understanding the actual population distribution over the land.