United States Capitol. Photo by Otto Jula.
Since 1800, The 50 states are the main administrative divisions of the country.
These are subdivided into counties or county-equivalents and then divided into municipalities.
The District of Columbia is a federal district that contains the capital of the United States, Washington, D.C. The states and the District of Columbia elect the president of the United States. Each state has presidential electors equal to the number of its representatives and senators in Congress; the District of Columbia has three by the 23rd Amendment.
In neutral US territories like Puerto Rico, US citizens, cannot vote for the president.