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Presidential system
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A presidential, strong-president, or single-executive system is a form of government in which a head of government heads an executive branch that derives its authority and legitimacy from a source tha
Portrait of James Wilson, who largely designed the powers of the president of the United States.
Portrait of James Wilson, who largely designed the powers of the president of the United States.
Head of government
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In the executive branch, the head of government is the highest or the 2nd-highest official of a sovereign state, a federated state, an autonomous region, a dependent territory, a self-governing colony
President Dilma Rousseff of Brazil and President Christina Kirchner of Argentina in 2015
President Dilma Rousseff of Brazil and President Christina Kirchner of Argentina in 2015
The heads of government of five members of the Commonwealth of Nations at the 1944 Commonwealth Prime Ministers' Conference. From left to right, Macke
The heads of government of five members of the Commonwealth of Nations at the 1944 Commonwealth Prime Ministers' Conference. From left to right, Mackenzie King (Canada), Jan Smuts (South Africa), Winston Churchill (United Kingdom), Peter Fraser (New Zealand), and John Curtin (Australia).