1949 is the end of the Chinese Civil War (and thus the triumph of the communists) and 1959 is the Cuban Revolution. 476 is indeed the fall of Rome and the beginning of the Dark Ages.
I don't get all the dates. 1789 is French Revolution, 1917 is Fall of
Czarist Russia, is 476 the fall of Rome? 1949 Korea and 1959 Vietnam or
China Revolution?
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"He that would make his own liberty secure must guard even his enemy from oppression; for if he violates this duty he establishes a precedent that will reach to himself." -- Thomas Paine