Answer:
Refundable Materials.
Step-by-step explanation:
If Douglass buys more refundable materials, held from Seneca Falls, then New York can be his main cause, because the struggle against slavery and racial discrimination was very serious.
So, by learning about this history, you can get the summary of which is: Seneca Falls, then New York because the struggle against slavery and racial discrimination was a very serious topic that will not be treated lightly.
Thank you all for your time. And that is my reasoning.