Washington was the 42nd state in the USA; it became a state on November 11, 1889. - State Capital is Olympia. - Nickname is The Evergreen State. - Washington's official flag was adopted in 1923. The flag has a deep green background with the state seal in the center. The state seal pictures George Washington, the first president of the United States. "THE SEAL OF THE STATE OF WASHINGTON" is written in black on the yellow band surrounding George Washington. The state seal was designed in 1889 by Charles Talcott. This is the only US state flag that pictures a president and the only one with a green background.