none (commonwealth in political union with the US)
National holiday:
Commonwealth Day, 8 January (1978)
Constitution:
Constitution of the Commonwealth of the Northern Mariana Islands effective 1 January 1978; Covenant Agreement fully effective 4 November 1986
Legal system:
based on US system, except for customs, wages, immigration laws, and taxation
Suffrage:
18 years of age; universal; indigenous inhabitants are US citizens but do not vote in US presidential elections
Executive branch: