Wikipedia:Selected anniversaries/June 20
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June 20: Flag Day in Argentina (since 1938)
- 1756 - A garrison of the British army in India was imprisoned in the Black Hole of Calcutta.
- 1789 - 577 deputies of the French National Assembly took the Tennis Court Oath, starting the French Revolution.
- 1837 - Queen Victoria succeeded to the British throne.
- 1947 - A Mafia hitman murdered gangster Bugsy Siegel in Beverly Hills, California, United States.