District of Columbia not visible on Region Map

Hello, I am trying to display some data grouped by US states on the US region map.
However, I am not able to see the District of Columbia visualized. Is there an error in my country naming or is DC too small to be visible? Is it included in the map?

The US region map only has the 50 states - DC isn't included. You can read more about making custom maps if you're interested exploring that option: Custom maps