National holiday:
Independence Day, 4 July (1776)
Constitution:
17 September 1787, effective 4 March 1789
Legal system:
federal court system based on English common law; each state has its own unique legal system of which all but one (Louisiana, which is still influenced by the Napoleonic Code) is based on English common law; judicial review of legislative acts; has not accepted compulsory ICJ jurisdiction
Suffrage:
18 years of age; universal
Executive branch:
chief of state: President Barack H. OBAMA (since 20 January 2009); Vice President Joseph R. BIDEN (since 20 January 2009); note - the president is both the chief of state and head of government