The first president of the united states
1. Environment impact
2. Health/physical impact
I think it was because transportation was made way easier and it offered better options for people who wanted to travel. Also i believe at the time the west was rich because of the foreseen treasures such as gold found there so people wanted to travel west to get rich.
Social structure, religion, technology( inventions that made things easier)
The south resisted any change the north tried to create.
ex: poll taxes on freedmen
