Answer: Image result for how did the united states justify imperialism
Americans justified imperialistic behavior by: Claiming that it was their responsibility. Americans and Europeans both claimed that it was their responsibility as superior races to uplift, civilize and Christianize native peoples. This was known as the White Mans Burden and was based upon the ideas of social Darwinism.
Answer:
Gold rush and mining opportunities (silver in Nevada) The opportunity to work in the cattle industry; to be a “cowboy” Faster travel to the West by railroad; availability of supplies due to the railroad. The opportunity to own land cheaply under the Homestead Act.
Explanation:
They were a strength to the Union. They carried soldiers and supplies to the battlefront much quicker, from a few months' march to a week. Having the supplies quicker to the battleground gave the Union the advantage over the Confederates, since the Union could recover much faster from any loss.
A.
Lincoln was attempting to make the war about the South's slaves so that the now largely slave-less France and Britain would refuse to support the South.