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The Japanese Fascism League overthrew the Japanese government in the 1930s. Seigo Nakano became the recognized leader of the league.
League of Nations
It was unable to control the growth of dictatorships during the 1920s and 1930s.
Fascism existed in Italy under Benito Mussolini's rule in the 1920s, 1930s and 1940s.
they did not join the league of nations
The first example is the Japanese invasion of Manchuria. The League of Nations disapproved but had no means to stop the invasion. Mussolini then invaded Ethiopia in 1935, and the League of Nations was unable to take action against him. Finally, in 1936, Hitler began to remilitarize Germany, and there was no reaction from the League of Nations.
pusuit of classless society
Currently, most Japanese are horrified by fascism (and there is a strong pacifist movement in Japan), but historically, especially in the 1930s and 1940s, Japanese people were very patriotic and militaristic, making fascism popular.
Fascism from 1933 until 1945
Communism. This is one reason Britain appeased Germany in the 1930s. Britain would have preferred fascism over communism.
By 'advances' do you mean attempts to woo, that is, join the League or do you mean Hitler's triumphs in the 1930s?
Fascism in Europe during the 1920s and 1930s can best be described as a form of totalitarianism. It elevated the state above the individual.