Politics of the Northern Mariana Islands takes place in a framework of a presidential representative democratic system, whereby the Governor is head of government, and of a pluriform multi-party system. The Northern Mariana Islands are a commonwealth in political union with the United States. Executive power is exercised by the governor. Legislative power is vested in the two chambers of the legislature. The judiciary is independent of the executive and the legislature. Local government is carried out through three regional mayors.
The Northern Mariana Islands and the United States of America reached a Covenant Agreement which became fully effective on November 4, 1986. The Constitution of the Commonwealth of the Northern Mariana Islands became effective on January 1, 1978.
The Northern Mariana Islands Commonwealth Legislature has two chambers. The House of Representatives has 20 members, elected for a two-year term from seven districts. The Senate has 9 members, elected for a four-year term in two staggered classes.
Prior to January 2009, the Commonwealth maintained an elected "Resident Representative" in Washington, DC. As authorized by Pub.L. 110–229, the Commonwealth now elects a nonvoting delegate to the U.S. Congress (similar to other U.S. insular areas). The first election was held on November 4, 2008.