Levi Strauss, a Bavarian-born dry goods merchant who had emigrated to San Francisco in 1853 to sell supplies to Gold Rush miners, was approached by Jacob Davis, a Latvian-born tailor working in Reno, Nevada, who had developed a technique using copper rivets to reinforce the stress points on work trousers — a genuine innovation addressing a real, practical problem, since ordinary trousers of the era tended to tear at pocket corners and other stress points under the demanding physical labor miners and other laborers performed. Davis, lacking the funds to patent the idea himself, partnered with Strauss, who supplied his denim fabric, and the two men received a US patent for the riveted design in May 1873, generally considered the founding moment of blue jeans as a distinct product.
For decades following this patent, jeans remained primarily marketed and understood as durable workwear for laborers, miners, farmers, and cowboys, particularly in the American West. Their transformation into mainstream, and eventually global, fashion developed gradually over the following century, accelerated significantly by their adoption as a symbol of youth culture and rebellion in mid-twentieth-century American film and popular culture — actors including Marlon Brando and James Dean wearing jeans in prominent 1950s films helped associate the garment with a countercultural, youthful image that expanded its appeal well beyond its original working-class, utilitarian market. By the latter twentieth century, jeans had become one of the most universally worn garments worldwide, crossing class, national, and cultural lines in a way relatively few clothing items have achieved, produced and worn on a massive global industrial scale.