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Mao Zedong, the leader of the Chinese Communist Party, lead the Long March in 1934.
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France and Great Britain - two countries which were trying to avoid war through appeasements and treaties - were pushed into declaring war on Germany after Adof Hitler invaded Poland (an obvious sign of agression).
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Japan attacked the US naval base in Hawaii's 'Pearl Harbor' in 1941.
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In 1945, after the end of the war, the United Nations (an updated and reformed version of the League of Nations) was created.
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Germany - the former WWII agressor - surrendered in 1945.
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The Allies decided that the most effective way to bring a fast end to the war was to drop atomic bombs (or 'A-Bombs') on first Hiroshima and then Nagasaki in 1945.