The Democratic Party lost popularity and the 1952 election because of U.S. involvement in Korea. The heavy cost of the war in terms of money and American lives and the failure to win the war were partial reasons for the loss.
I am not sure on what the right answer is but I would choese C or D.
Lead expeditions to make the area. Made transportation a lot easier by expanding railroads out west. Created roads for easier travel. Established courts and government buildings. Sent the armed forces to make sure everything was safe. The question is vague so I kind of have to give you a vague answer.