Lincoln's assassination damaged the north's and south's relationship, increasing the north's hate toward the south. His death gave the Radical Republicans more freedom to punish the south. And it put Andrew Johnson in charge who also wanted to punish the south and had a very bad relationship with the Congressmen.
I don't know what the video was so I can not answer that I am sorry. But I did think and write about your first question.
Frederick Douglass, William Lloyd Garrison, and John Brown all believed that slavery should be abolished. The people who share this common belief are called Abolitionists.
