Unit 10 By keiry_mireya03 Apr 20, 1862 Congress authorizes transcontinental railroad Apr 20, 1866 National Labor Union organizedFirst working transatlantic telegraph cable Apr 20, 1869 1869 Transcontinental railroad joined near Ogden, UtahKnights of Labor organizedSuez Canal completed Apr 20, 1870 Standard Oil Company organized Apr 20, 1876 Bell invents telephone Apr 20, 1879 Edison invents electric light