3. By 1840 the US government had moved all of the eastern tribes to behind the 95th meridian or the Permanent Indian Frontier. Land behind it was seen by the whites as the ‘Great American Desert’ and was given to the Indians forever. The Permanent Indian Frontier (around 1834) The Permanent Frontier was not permanent at all. White settlers in the east crossed the plains on the Oregon and California Trails, particularly after the 1848 gold rush. The Indians attacked them as they felt invaded!