The 50 states are the principal political divisions in the country. Each state holds jurisdiction over a defined geographic territory, where it shares sovereignty with the federal government. They are subdivided into counties or county equivalents and further divided into municipalities. The District of Columbia is a federal district that contains the capital of the United States, the city of Washington. The states and the District of Columbia choose the president of the United States. Each state has presidential electors equal to the number of their representatives and senators in Congress; the District of Columbia has three because of the 23rd Amendment. Territories of the United States such as Puerto Rico do not have presidential electors, and so people in those territories cannot vote for the president.