He worked tirelessly and made inspiring speeches to the nation.
He was also unpopular with trade union members and the working class, as he was one of the main people who helped to break the 1926 General Strike.
Although he was seen as a great leader who didn't give an inch during war, he was not thought of as someone to make a better Britain during peacetime.
And so he lost power in the 1945 election.
Before his funeral in 1965, thousands of people queued to see his coffin lying in state in Westminster Hall.
Why was he important?
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