1. In 1901, Oil was discovered in Washington for the first time by George D. Brunn and his partners in Yakima County, thereby marking the beginning of a major industry for the state.

2. In 1926, Seattle's University of Washington inaugurated its new Husky Stadium with a football game against Dartmouth College which was a major milestone in the history of the schools athletics.

3. On January 10, 1946, the world's first commercially produced atomic clock, the Model A, was built by scientists from the National Bureau of Standards in Washington D.C. thereby revolutionizing time-keeping technology.

4. In 1969, The Boeing 747, the world's first jumbo-jet, took its maiden flight from Seattle's Paine Field to New York, marking a major step forward in commercial aviation.

5. In 1977, The Space Needle, Seattle's iconic tourist attraction, was designated a historic landmark by the city authorities, reflecting its importance as a symbol of the city's growth and development.