I would go with A) the fall of the Berlin Wall. When it fell, it symbolized the end of the division between East and West Germany and acted as a rallying image for the end of Communism in Europe.
Loyalty oaths in the US were initiated during the 1950s and 1960s. During the 1950s during Soviet annexation of eastern European Nations and developing a Nuclear Threat.
Senator Joseph McCarthy swayed the Nations thoughts to concern about communist spies, agents and saboteurs and a fear agents may injure the U.S. government through espionage or violence.
They were basically to secure the loyalty and well being of American citizens.
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