The founders of the country wished to have a leader who elected by all the citizens of the nation, and thus enshrined such a position in their constitution, calling the position a president instead of a prime minister.
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To explain the term in the UK, the Prime Minister is elected as a constituency MP, and remains such, but is elevated to PM by the party.
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The United States does not have a Prime Minister. The head of the executive branch in the United States is the President. George Washington was the first President of the United States, serving from 1789 to 1797.
A prime minister is an elected member of a parliament, just like all the others. In each election the prime minister must stand for election in their constituency. If they lose, then they will no longer be a member of the parliament and cannot become a prime minister again.
The Prime Minister is the leader of the English Parliament.
The prime minister.
Please note that in Britain the reigning monarch does not elect the prime minister. When Elizabeth II succeeded her father on 6 February 1952 Winston Churchill was the prime minister.