What causes a change in seasons?
revolution
rotation
plate tectonics
Od
erosion

people often think that the Earth is closer to the Sun during the summer. And it's farther away during the winter. ... The distance between the Earth and the Sun does not affect the seasons. Seasons change because of the tilt of the Earth and the planet's movement around the Sun.

Explanation:

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.