Wikipedia:Selected anniversaries/July 1
- 251 - The Goths under Cniva defeat the Roman Empire at the Battle of Abrittus and kill both Roman Emperors, Decius and his son and co-emperor Herennius Etruscus.
- 1867 - The Province of Canada, New Brunswick, and Nova Scotia united in Confederation. (Flag of Canada pictured)
- 1904 - The first Olympic Games in North America opened in St. Louis, Missouri.
- 1916 - The first day on the Somme, the bloodiest day in the history of the British Army.
- 1991 - The Warsaw Pact was officially dissolved.
- 1997 - The sovereignty of the British crown colony of Hong Kong was transferred to the People's Republic of China, to be governed as a special administrative region under the policy of "One country, two systems".