Rise of Totalitarianism By 1229789 May 10, 1940 May 1940 Winston Churchill becomes UK prime minster. Dec 30, 1941 October 1941 General Hideki Tojo becomes Japanese prime minister Jul 26, 1945 January 1883 When Clement Attlee became prime minister of the UK. Dec 15, 1948 October 1948 When Shigeru Yoshida became Prime Minister.