Wikipedia:Selected anniversaries/April 22
This is a list of selected April 22 anniversaries that appear in the "On this day" section of the Main Page. To suggest a new item, in most cases, you can be bold and edit this page. Please read the selected anniversaries guidelines before making your edit. However, if your addition might be controversial or on a day that is or will soon be on the Main Page, please post your suggestion on the talk page instead.
Please note that the events listed on the Main Page are chosen based more on relative article quality and to maintain a mix of topics, not based solely on how important or significant their subjects are. Only four to five events are posted at a time and thus not everything that is "most important and significant" can be listed. In addition, an event is generally not posted this year if it is also the subject of the scheduled featured article or picture of the day.
To report an error when this appears on the Main Page, see Main Page errors. Please remember that this list defers to the supporting articles, so it is best to achieve consensus and make any necessary changes there first.
April 22: Earth Day; Administrative Professionals' Day (2009)
- 1864 – The U.S. Congress passed the Coinage Act, authorizing the minting of a two-cent coin (pictured), the first U.S. coin to bear the phrase "In God We Trust".
- 1889 – Over 50,000 people rushed to claim a piece of the available two million acres (8,000 km2) in the Unassigned Lands, the present-day U.S. state of Oklahoma. Within hours, both Oklahoma City and Guthrie had established cities of around 10,000 people.
- 1915 – The Germans released chlorine gas as a chemical weapon in the Second Battle of Ypres, killing over 5,000 soldiers within ten minutes by asphyxiation in the first large-scale successful use of poison gas in World War I.
- 1945 – About 600 prisoners of the Jasenovac concentration camp in the Independent State of Croatia revolted, but only 80 managed to escape while the other 520 were killed by the Croatian Ustaše regime.
- 1993 – The first version of Mosaic, created by computer programmers Marc Andreessen and Eric Bina at the National Center for Supercomputing Applications of the University of Illinois at Urbana-Champaign, was released, becoming the first popular World Wide Web browser and Gopher client.