The United States and Canada culture region is highly populated in some areas, while sparsely populated in other areas. As you can tell by the image below, the eastern part of this culture region is highly populated, averaging more than 100 people per square mile, while the western areas are sparsely populated, averaging less than 20 people per square mile.
The image below of the United States and Canada culture region at night is another way to show population density. You can tell by the image that the eastern parts of this region are more densely populated than the most northern, and western areas.