The factors are:
- Job opportunities
This happen due to the adoption of industrial evolution which require many workforce to help with the production
- Land availibiulity
The government announced that settlers from outside united states could come in an purchase land on a heavily discounted prices
- Huge amount of natural resources in our territory
I believe it would be chimpanzees with the rage disease
C is the correct answer I hope you get it
Maine and Missouri were added