The Pacific Railroad is joined by several branches in Iowa, Kansas, Colorado, and Oregon. On leaving Omaha, it passes along the left bank of the Platte River as far as the junction of its northern branch, follows its southern branch, crosses the Laramie territory and the Wahsatch Mountains, turns the Great Salt Lake, and reaches Salt Lake City, the Mormon capital, plunges into the Tuilla Valley, across the American Desert, Cedar and Humboldt Mountains, the Sierra Nevada, and descends, via Sacramento, to the Pacific—its grade, even on the Rocky Mountains, never exceeding one hundred and twelve feet to the mile.According to the passage, how many states have branches of the Pacific Railroad?