In 1862, when the charter was granted by the United States Government for the construction of a railroad from Omaha to the Pacific coast, the only States west of the Mississippi Valley in which any railroad construction of importance existed were Iowa and Missouri. During the three decades which had passed since the first railroad construction, the earlier methods of transportation by boat, canal, and stage coach gave place in the Eastern half of the United States to more modern methods of transportation. As a result of these new conditions, the States, cities, and towns were welded together, and population and prosperity increased rapidly in those inland sections which had formerly languished because they had no means of easy and rapid communication. The construction of extensive railways, however, and particularly the consolidation of small, experimental lines into large systems, dates from the days of the discovery of gold in California. The nation did not begin to realize the extraordinary possibilities of the vast Western territory until its attention was thus suddenly and definitely concentrated on the Pacific by the annual addition of over fifty million dollars to the circulating medium. The wealth drawn so copiously from this Western part of our continent had a stimulating effect on the commerce, manufactures, and trade of the entire Eastern section. People began to understand that with the acquisition of California the nation had obtained practically half a continent, of which the future possibilities were almost unlimited, so far as the development of natural resources and the general production of wealth were concerned. The public conviction that a railroad linking the West and the East was an absolute necessity became so pronounced after the gold discoveries of '49 that Congress passed an act in 1853 providing for a survey of several lines from the Mississippi to the Pacific. Though the published reports of these surveys threw a flood of light on the interior of the continent, they led to no definite result at the time because the rivalry of sections and groups of interests for the selection of this or that route held up all progress.