Wikipedia:Selected anniversaries/May 18
On May 18:
- 1896 - The U.S. Supreme Court ruled in Plessy v. Ferguson that "separate but equal" was constitutional.
- 1926 - Evangelist Aimee Semple McPherson disappeared (she was later found in Mexico).
- 1944 - The Battle of Monte Cassino ended with a German evacuation of Monte Cassino.
- 1958 - An F-104 Starfighter set a world speed record of 1,404.19 mph.
- 1980 - Mount St. Helens erupted in Washington, killing 57 and causing $3 billion (USD) in damage.