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November 14, 1954
Eden Medical Center opens in Castro Valley.
September 22, 1955
City of Newark incorporates to avoid being swallowed by the emerging city of Fremont.
January 23, 1956
City of Fremont incorporates from the towns of Centerville, Irvington, Mission San Jose, Niles and Warm Springs.
January 26, 1959
Towns of Alvarado and Decoto combine to create Union City.