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1830-1831
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World War II (WWII) begins
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Communist government restricted normal life in Poland hoping to crush political opponents.
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North Atlantic Treaty Organization guarantees freedom and security of members by political and military force.
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President Lech Kaczynski along with many top government leaders were killed in a plane crash while trying to land in heavy fog.
https://www.nytimes.com/2010/04/11/world/europe/11poland.html