In the 20th century, Estonia was a sovereign state from 1919 to 1940. At that time, it was forced to become a socialist republic of the Soviet Union. Then, in 1991, the Soviet Union collapsed, and on August 20 of that year, Estonia formally re-established its independence. Throughout 2008, the country celebrated its 90th anniversary as a republic. This is one of three days on which the national flag must be hoisted on state buildings, along with Victory Day (June 23) and Independence Day (February 24). Discuss
Source: The Free Dictionary