The Government of Maryland is conducted according to the Maryland Constitution. The United States is a federation; consequently, the Government of Maryland, like the other 49 state governments, has exclusive authority over matters that lie entirely within the state's borders, except as limited by the Constitution of the United States. Power in Maryland is divided among three branches of government: executive, legislative, and judicial. Unlike most other states, significant autonomy is granted to many of Maryland's counties. Most of the business of government is done in Annapolis, the State capital. Virtually all state and county elections are held in even-numbered years not divisible by four, in which the President of the United States is not elected — this, as in other states, is intended to divide State and Federal politics.