This diagram shows types of ecosystems near the Sonoran Desert and Chihuahuan Desert. How is a thornscrub ecosystem different from a desert?
O A. The thornscrub occurs at a lower elevation
O B. The thornscrub receives more sunlight
O C. The thornscrub receives more rain
D. The thornscrub has sand dunes

PLEASE HELP ASAP

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.

i think the answer to your question is: settlement of the interior and economic growth. ( ^_^)／