Who was the longest serving British Prime Minister of the 20th century?
Margaret Thatcher, who led Great Britain from 1979 until 1990 was longest serving British Prime Minister of 20th century. Margaret Thatcher, the Iron Lady, ruled for 11 remarkable years. She imposed her will on a fractious, rundown nation while breaking the unions, triumphing in a far-off war, and selling off state industries at a record pace. when she left the job, she left behind a leaner government and more prosperous nation before a mutiny ousted her from No. 10 Downing Street.
Margaret Thatcher retired from public activities in 2002 after a series of strokes. She was seldom seen in public after her retirement. Today, she remains the only woman to have served as Prime Minister of Great Britain. In 2013, she died from another stroke in London at the age of 87.