On June 5, 1977, the Portland Trail Blazers won their first and only NBA Championship.
On June 4, 1890, the state's shortest streetcar line, the Baker City Railway Company, began operating.
On June 3, 1889, the Willamette Falls Electric Company uses water from the Willamette River to power the nation's first long distance transmission of power.
On June 2, 1902, Oregon voters overwhelmingly approved a ballot measure, creating the state's initiative and referendum process that's still in use today.
On June 1, 1905, Portland launched its only world's fair, featuring the Lewis & Clark Exposition.
The Tournament of the Americas, which served as the qualifying round for the Olympics, was played at Memorial Coliseum in Portland.