What I can infer from what Lewis and Clark saw when moving west from the Mississippi river is that the landscape along the river changed drasticallly. The forest receded, replaced first by the high prairie and then the shorter grass of the high plains. The temperatures became colder and as they continued their expedition by the river they realized that there was no water route to the pacific ocean, just more mountains.
House of Representatives and Senate
The method of manufacturing that made mass production in the USA possible was the implementation of interchangeable assembly parts leading up to the moving <span>assembly line for large scale production.</span>
The Korean war, in fact was never formally declared a war at all, and it was never officially decreed over. an armistice out put an end to the fighting that had claimed the lives of 5 million people, including 36, 934 Americans.