Arnold is concerned about his impact on the environment. currently he drives a car that only gets 12 miles per gallon of gas. which of the following would be the most effective measure to lessen his environmental impact?
a. drive at a higher rate of speed
b. switch to a car that gets 30 miles per gallon
c. purchase higher octane gas
d. travel by plane

the first phase of the government’s plan for settlement was building the transcontinental railroad. the railroad provided a way to bring settlers and manufactured goods west and ship their agricultural and mining produce east. the transcontinental railroad was an essential artery for rapid development of the frontier.

the second phase of the government’s plan was a liberal land distribution policy that made it possible for many people to homestead. with these two key elements—transportation and cheap land—the government rapidly achieved its goal of persuading people to move west, settle on farms, and push back the frontier.