The monarch’s chaotic love life led to an unstable succession, foreign policy changes and a break with Rome.
More than 35,000 volunteers from 52 countries poured into Spain to help fight fascist-backed Nationalists led by Francisco Franco.
These people played integral roles in the uprising that swept through France from 1789-1799.
The Soviet Union, founded in 1922 on Marxist-socialist principles, became one of the biggest and most powerful nations in the world—before its fall and dissolution in 1991.
The brutal violence of the Russian Revolution culminated in the execution of Tsar Nicholas II and his entire family, ending 300 years of Romanov rule over the Russian Empire.
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