September 18, 1931
1931 dispute in Iowa over testing cows for bovine tuberculosis.
The Persistence of Memory — painting by Salvador Dalí completed in 1931. Also known as Soft Watches or Melting Clocks, it is one of Dalí’s most famous pieces.
1931 China floods — series of devastating floods
Statute of Westminster 1931 — United Kingdom legislation
4th Chess Olympiad — FIDE chess tournament for national teams
1931 boundary conflict between the U.S. states of Oklahoma and Texas
Battle of Shuangqiaozhen
Battle during the Italian colonization of Libya
Assassination by KPD supporters on police officers in Berlin on August 9, 1931
Most powerful earthquake in Texas history