Which empire builder established an infrastructure of roads, bridges, and lodgings to control his empire?

One of the observations by someone who was present for roosevelt's speech was, "its clarity, logic, and sincerity struck us." quote one example from the text that you would describe as clear, logical, or sincere. explain the language in your chosen quote correctly, and tell why it can be considered clear, logical, or sincere.

Someone who accepted the beliefs of social darwinism would have also agreed with which of these statements?

How did isolationism affect foreign policy?