Timeline of the Tri-Cities, Washington

The following is a timeline of the history of the Tri-Cities, an area of the U.S. state of Washington encompassing the cities of Kennewick, Pasco, and Richland. == Before the 19th century == Native Americans explore and settle throughout the Columbia Basin region which includes the Tri-Cities area.

Source: Wikipedia — Timeline of the Tri-Cities, Washington (CC BY-SA 4.0)