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October 20 in history: China ignites Sino-Indian war, opening of the Sydney Opera House and more

1921
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1921

France and the Grand National Assembly of Turkey signed the Treaty of Ankara.

1961
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1961

USSR conducts first armed test of a submarine-launched ballistic missile.

1962
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1962

China launches offensives across McMahon Line, igniting the Sino-Indian war.

1973
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1973

After 14 years of construction, the Sydney Opera House opens.

2011
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2011

Libyan de facto leader Muammar al-Qaddafi killed by rebel forces.