How are tides caused by the gravitational pull of the moon and sun?

Explanation:  

High and low tides are caused by the Moon.

The Moon's gravitational pull induces something called the tidal force.

The tidal force causes Earth—and its water—to bulge out on its nearest and furthest sides from the Moon.

The Moon is responsible for high and low tides.

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.