They would feel this because they viewed themselves as the superior race. Using social darwinism to justify their colonization they would go and bear what they called "the white man's burden." They would use improvements in transportation and communication as a reason it was good for the colonized as well. There may have also been feelings of nationalism because of fear of other European nations taking up all the resources and colonies.
It gave the president the power to divide American Indian land into allotments
So that railroad companies could build railroads, expanding travel across one's country.
