The U.S. as Archipelago

The U.S. population distribution is uneven. This irregular distribution of the Homo sapiens is due to historical and physical factors like climate or soil conditions. Hence, about 40%t of the United States population lived on the coast, and the western U.S.'s broad expanses are almost empty.

I tried to draw the United States' block-level population density as a relief map. Unpopulated areas are colored like a continental shelf.

More maps you can find here.