Historical Events on October 31

19 significant historical events occurred on October 31. October 31 is marked by several historical events. In 1918, the Aster Revolution began in Hungary. In 1952, the United States conducted its first full-scale hydrogen bomb test, known as Ivy Mike. The date is also known for the assassination of Indian Prime Minister Indira Gandhi in 1984. Additionally, on October 31, 1999, EgyptAir Flight 990 tragically crashed in the Atlantic Ocean.