Template:OpenHistoricalMap/On this day/09/23
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- 1524
- The Three Leagues forms within the Swiss Confederacy.
- 1793
- The Polish–Lithuanian Commonwealth is partitioned for a second time between Prussia and Russia, creating South Prussia.
- 1810
- The Republic of West Florida declares independence from Spanish Florida.
- 1856
- The United States Army occupies a second Fort Walla Walla in an area contested between Washington Territory and the Walla Walla people.
- 1957
- Southfield is incorporated as a city in Michigan, withdrawing from Southfield Township.
- 1957
- Westwood is incorporated as a village in Michigan.
- 1958
- The Spirit of Detroit is dedicated in Detroit, Michigan.
- 1993
- The Warner West End cinema debuts in London after its reconstruction.
This is a selection of establishments and disestablishments on September 23, based on OpenHistoricalMap data, that automatically appears on the OpenHistoricalMap page on September 23 of each year. This list highlights important changes in the world, as well as more mundane events that demonstrate the project's ambitious tendency toward micromapping history.
Contributing
We appreciate your help in curating these events from OpenHistoricalMap data. Items should be based on fully qualified start_date=* and end_date=* tags, plus any other metadata tagged on features in OpenHistoricalMap. To the extent possible, the list should feature a wide range of years and include events from different continents.