The Declaration of State Sovereignty of the Byelorussian Soviet Socialist Republic was a formal document issued by the Supreme Soviet of Belarus to assert its independence from the Soviet Union. Passed on July 27, 1990, the Declaration started the process of Belarus' eventual independence on August 25, 1991. Until 1996, July 27th was celebrated as Independence Day in Belarus.
It effectively renamed the Byelorussian SSR to the Republic of Belarus and established the basis for all state symbols, such as the National flag and coat of arms, the national anthem, and the national colors. It also defined the national currency, military, and language.