How has mobility shaped the development of what became the United States? You ca

How has mobility shaped the development of what became the United States? You can
approach this question in one of two ways (at least). You could focus on the physical
movement of people and demonstrate how immigration and expansion have contributed
the development of the United States
Each answer should cite evidence from the textbook, the videos, and the course materials. 
Here’s a the link to the free textbook: https://openstax.org/details/books/us-history