1893 - Upon taking ownership of Grass Valley Daily Union, William Prisk — the paper’s proprietor for the next 53 years — announces “The new ‘Union’ .. (will discard) the ancient and worn out type” by installing a Mergenthaler Linotype typesetting machine. By 1895, Prisk was publishing both a daily and weekly edition of The Union.
1906 - Great San Francisco Earthquake strikes on April 18, which along with resulting fires causes an estimated 3,000 deaths and $524 million in property loss. According to the U.S. Geological Survey, the “sensible duration of the shaking (7.8 magnitude) in San Francisco was about 1 minute.”
1906 - After 13 years of ownership of The Union, Prisk moves the newspaper from the southwest corner of Mill and West Main streets to 151 Mill St. in downtown Grass Valley, where it was published until the 1978, when it was moved to its current 464 Sutton Way location in the Glenbrook Basin.
1907 - In March, Lyman Gilmore opened the world’s first commercial air field in Grass Valley which he operated until the hangar was destroyed by fire in 1935. The location of the air field is now the site of Lyman Gilmore Middle School, off West Main Street in Grass Valley.
1914 - On June 28, Archduke Franz Ferdinand heir to the throne of the Austro-Hungarian Empire, and his wife are assassinated in Sarajevo. One month later, Emperor Franz Joseph of Austria-Hungary declares war on Serbia, marking the beginning of World War I, which the United States entered on April 6 1917, after President Woodrow Wilson asked congress for a formal declaration of war.
1918 - The First World War, which resulted in the death of approximately 20 million people, comes to an end on Nov. 11, 1918 with the signing of an armistice at 11 a.m. Paris time. Grass Valley’s “The Morning Union” published an “extra” edition at 10 a.m. announcing the end of war and planned parade scheduled for 2 p.m. later that day in Grass Valley.
1920 - Passed by Congress June 4, 1919, and ratified on Aug. 18, 1920, the 19th amendment — including the 29 words originally written by Nevada City native and former U.S. Senator Aaron A. Sargent — guarantees all American women the right to vote.
1921 - After five years of engineering studies, negotiations of water rights and a local campaign to build support, the Nevada Irrigation District was formed by voters, creating a water system first envisioned by Munson B “Bert” Church and his wife, Kate, during a 1917 cattle dry in western Nevada County. Ten days following the Aug. 5, 1921 election — which resulted in a 536-163 vote in favor of the district — the first board meeting was held at Grass Valley’s Bret Harte Hotel.
1922 - Grass Valley Troop 4 of the Boy Scouts of America is formed. The local troop celebrated its 90th anniversary in September 2013 with a celebration at Memorial Park in Grass Valley.