Answer:
Some were used for burial mounds , the presence of human remains would reveal that purpose.
Explanation:
Supreme Court Chief Justice Roger B<span>. </span>Taney<span> made the pro-slavery ruling in the 1857 Dred Scott Case that deemed blacks weren't citizens of the United </span>States<span>.</span>
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
