Editing Tri-Valley (section)

== History ==
The [[Ohlone]] tribe settled the area circa 2000 BC, particularly in the northern part of Pleasanton. In AD 1772, however, Spanish settlers involved with the nearby mission work at Mission San Jose restructured the Ohlone way of life.<ref>{{Cite web |title=Chapter 9. Ohlone/Costanoans in the United States, 1847-1927 |url=https://www.nps.gov/goga/learn/historyculture/upload/Chapter-9.pdf |access-date=11 February 2023}}</ref><ref>{{Cite web|url=http://pleasanton.com/channel/History-of-Pleasanton/4821|title=History of Pleasanton|website=pleasanton.com|language=en|url-status=dead|archive-url=https://web.archive.org/web/20171108011655/http://pleasanton.com/channel/History-of-Pleasanton/4821|archive-date=November 8, 2017|access-date=2018-01-01}}</ref> 

The area began to be developed when the [[Gold rush|Gold Rush]] ended. During this period, the area went from being marshland to agricultural.<ref>{{Cite web|url=http://www.museumonmain.org/history-of-pleasanton.html|title=History of Pleasanton|website=Museum on Main|access-date=2018-01-01}}</ref>