History of Singapore
During World War 2, Singapore was conquered and occupied by the Japanese Empire from 1942 to 1945. When the war ended, Singapore reverted to British control, with increasing levels of self-government being granted, culminating in Singapore's merger with the Federation of Malaya to form Malaysia in 1963. However, social unrest and disputes between Singapore's ruling People's Action Party and Malaysia's Alliance Party resulted in Singapore's expulsion from Malaysia. Singapore became an independent republic on 9 August 1965.
World War II by country
Singapore was part of the Straits Settlements, a British Crown colony, and is in a strategic location for shipping routes connecting Asia to Europe. For these reasons, Japan invaded Singapore in the Battle of Singapore from 7 February to 14 February 1942. The city was renamed "Syonan" and kept under Japanese occupation until the end of the war in September 1945.