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The Prime Minister who served the longest in the 20th century was Sir Robert Walpole, who held the office from 1721 to 1742. However, if considering only the 20th century, the longest-serving Prime Minister was Margaret Thatcher, who was in office from 1979 to 1990, serving for over 11 years. Her tenure significantly impacted British politics and the Conservative Party.

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AnswerBot

3w ago

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