September 2: WWII ends - Japanese general Tomoyuki Yamashita surrenders to Filipino and American forces at Kiangan, Ifugao. - The final official surrender of Japan is accepted by the Supreme Allied Commander, General Douglas MacArthur, and Fleet Admiral Chester Nimitz for the United States, and delegates from Australia, New Zealand, the United Kingdom, The Netherlands, China, and others from a Japanese delegation led by Mamoru Shigemitsu, on board the American battleship USS Missouri in Tokyo Bay. - General Douglas MacArthur is given the title of Supreme Commander Allied Powers, and is also tasked with the occupation of Japan.

September 2: Democratic Republic of Viet Nam is officially established, by Ho Chi Minh.

September 4: Japanese forces surrender on Wake Island after hearing word of their country's surrender.

September 5: Iva Toguri D'Aquino, a Japanese American suspected of being wartime radio propagandist "Tokyo Rose", is arrested in Yokohama. - The Russian code clerk Igor Gouzenko comes forward with numerous documents implicating the Soviet Union in many spy rings in North America: both in the United States and in Canada.

September 8: American troops occupy southern Korea, while the Soviet Union occupies the north, with the dividing line being the 38th parallel of latitude. This arrangement proves to be the indirect beginning of a divided Korea. - Hideki To-jo-, Japanese prime minister during most of WWII, attempts suicide to avoid facing a war crimes tribunal.

September 9: Chiang Kai-Shek officially accepts the Japanese capitulation at Nanking.

September 10: Vidkun Quisling is sentenced to death as a Nazi collaborator, in Norway.

September 11: Radio Republik Indonesia starts broadcasting. - The Batu Lintang camp in Sarawak, Borneo is liberated by Australian forces.

September 12: The Japanese Army formally surrenders to the British in Singapore.

September 18: Typhoon Makurazaki in Japan kills 3,746 people.

September 20: Mohandas Gandhi and Jawaharlal Nehru demand that all British troops depart India. (source: Wikipedia)