It was the Cotton gin it made things easier and faster.
Answer:
When they formed they all could allocate their resources to better defeat the allies of the united states, pressuring the US into sending more resources that they barely had.
Explanation:
The correct answer is (d) the Oregon trail
that's the right answer for sure i god got that right tooo
hope that helps :)
Frederick Douglass and Harriet Tubman both were leaders of the movement and escaped slavery.