the United States. The captain simpson

you are: the United States

The period of the big travel of pioneers on territory of the United States comes to an end with railway researches and last expedition Fremonta. Already before these researches it has been made much for elimination of white stains from a card; and after them work has gone with all possible speed. 1857 was marked by research work of the lieutenant of Warren in Nebraska and Dakota and travel of lieutenant Ajvsa upwards on the river Colorado for the purpose of finding-out of its navigability. To a quince (Grand Canyon) has reached the Black Canyon by a boat, and from it a land-to of the Great Canyon. This expedition, to which structure geologists and botany entered, has captured a piece of a current of Colorado, an extent almost in 950 km but also after that the river still remained not completely investigated.

As a result of work of captain Simpson (1859) have been opened two convenient ways through the Big Pool, each of which has appeared better found Fremontom. The longitude of Salt Lake City has been precisely defined. The same year the lieutenant Dickson has opened a wheel way from Dallesa on the river of Colombia to Salt Lake City.

In 1858 the boundary commission has started demarcation established in 1846 between Canada and the United States borders on 49th parallel. In 1859 and 1860 expedition of captain Rejnoldsa ' has specified for the first time in a line subsequently the wheel way opened for movement from the river Platte to a threefold fork of Missouri round east foot of mountains Big-Horn. It has defined for the first time an exact watercourse Yellowstone from that place where it leaves mountains to a confluence of it of the river Pauder '. Rejnolds heard about ' burning plains, huge lakes and boiling sources ' near to sources of Yellowstone, but itself visit on them could not. Correctness reached to Rejnoldsa hearings was confirmed visited them in 1870 with the lieutenant G.Don, and all neighbouring territory has been photographed by expeditions of captain Barlou to 1871 and captain Johns to 1873 The detailed shootings made by them, and also shootings for research of a wheel line on the West, have led to liquidation of many white stains on a card, but occurrence of civil war in America has temporarily suspended this sort of work.