Utah Timeline By kkkkkkl Period: Jan 1, 1840 to Jan 1, 2010 Utah Span Feb 2, 1848 U.S. wins Mexican War Sep 9, 1850 Utah became a territory Sep 11, 1857 Mountain Meadows Massacre May 10, 1869 Railroads met at Promontory Summit Mar 1, 1879 First telephone service established Mar 3, 1887 Edmunds Tucker Act passes Congress Jan 4, 1896 Utah becomes a state Aug 9, 1909 Rainbow bridge was discovered Nov 19, 1919 Zion National Park is created Sep 15, 1928 Bryce Canyon National Park is established