For 10 points, name this event that was sparked by a discovery at Sutter's Mill in 1848, leading bunch of forty-niners to flock to a certain state.
This event ruined plans for an agricultural utopia called New Helvetia. The Dame Shirley letters documented this event, which led to a certain area gaining the Chinese nickname "Gum San." Poet Joaquin Miller documented this event's effect on the native population in Life Amongst the Modocs. The Cliff House was constructed by an early participant, Star newspaper publisher Samuel Brannan, who took to the streets yelling about the American River shortly after this event began. So-called Argonauts participated in this event, which began after James W. Marshall alerted his boss about some residue in a lumber mill water wheel. For 10 points, name this event that was sparked by a discovery at Sutter's Mill in 1848, leading bunch of forty-niners to flock to a certain state.
This event ruined plans for an agricultural utopia called New Helvetia.
the {California gold rush} (prompt on partial answer; accept {discovery} of {gold} in {California} or other equivalents; accept {Forty}-{Niner gold rush} before “{forty}-{niner}”)