Pendersleigh & Sons Cartography's map of Orange County
In early 1889, Pemberton Medicine Company (later Coca-Cola) incorporated in Atlanta, Colombia Phonograph (later Columbia Records) launched, Japan adopted the Meiji Constitution and the Eiffel Tower opened in Paris. Meanwhile in Southern California, the communities on Coyote Creek's left bank seceded those on the right bank and incorporated as the County of Orange. More precisely, on 11 March a bill was signed into law which allowed for voters to vote whether or not to approve the motion to incorporate -- which they did (2,509 to 500) on 4 June, 1889. But today's date is the one that is observed by most of Orange County's friends and family as its birthday.
It wasn't the first time county borders within California had changed. In the first half century after the US invaded and conquered Alta California from Mexico, the county borders have changed several times; San Bernardino County split from Los Angeles County in 1853, parts of Los Angeles County became Kern County in 1866, and in 1893 Riverside County was formed out of what had been parts of San Bernardino and San Diego counties. Several attempts were made and failed to establish Orange County in the 1870s and '80s.