Utah History Timeline By 16alandheim1 Jul 24, 1847 Brigham Young enters Salt Lake Valley Sep 11, 1857 Mountain Meadows Massacre May 10, 1869 Transcontinental Railroad is finished Mar 1, 1879 1st telephone demenstration in Salt Lake City Mar 22, 1882 Edmunds-Tucker Act is passed making polygamy illegal Jan 4, 1896 Utah becomes a state
