Answer:
Manifest destiny is a belief that many people in America at that time held. This belief made them convinced that they're somehow destined by God to spread democracy and capitalism to the rest of North America. The people at that time belief that it's the only correct system to ensure the freedom of all citizens.
But due to the large size of its territory, it is difficult to reach many different areas in north America. Railroad companies already exists. But, most of them only operates within one state. This problem was somehow solved by the creation of Transcontinental Railroad.
The transcontinental railroad was built with the intention to create a pathway connect all part of North America. It is an important infrastructure for the American people to create settlements in every corner of the country. This helped them spread the ideologies as intended in Manifest Destiny.
The answer is legal immigrant. There are many ways on which a person can become a legal immigran some of which are: job sponsorship, marriage, asylum seekers and so on. This is a very controversal topic in the US under Trump’s administration. Usually a legal immigrant is a holder of a ‘green card’ document.
In the "Great Compromise," every state was given equal representation, previously known as the New Jersey Plan, in one house of Congress, and proportional representation, known before as the Virginia Plan, in the other.
