What was the main difference between Frederick Douglass and the abolitionists Fanny Kemble, Harriet Beecher Stowe, and William Lloyd Garrison? Douglass had been a slave himself.
The other abolitionists were better writers.
The other abolitionists had no firsthand knowledge.
Douglass had no firsthand experience of slavery.

A. Douglass had been a slave himself

The First Continental Congress was created in order to talk about what the colonists were going to do about the Intolerable Acts. The Second Continental Congress was when they got together to talk about what to do after Lexington and Concord. They ended up creating the Olive Branch Petition.