Constitution and Malaysia (Singapore Amendment) Act 1965
The Constitution and Malaysia (Singapore Amendment) Act 1965 (Malay: Akta Perlembagaan dan Malaysia (Pindaan Singapura) 1965) is a constitutional amendment passed by the Parliament of Malaysia to separate Singapore from Malaysia. This act provided that Singapore would on 9 August 1965 cease to be a state of Malaysia and would then become an independent and sovereign country.
Source: Wikipedia — Constitution and Malaysia (Singapore Amendment) Act 1965 (CC BY-SA 4.0)