This shows Americans partying during July the 4th. It is implied that while they are partying, slaves are still working and getting whipped.
This shows a "savage" saying that slavery is wrong. This shows that even barbaric countries still find the practice of slavery appaling.
Fredericks speech on 4th of july was supposed to show the hypocrisy of the day America became free. So when he is next to the United States capitol and says it is a lie, he is talking about America's value of liberty is a lie because they own slaves.
You're coming back to the south.
This scene is taking place in a slave market and shows a slave woman being observed. Normally, they would be undressed which shows how little rights the slaves where given in the land of freedom.
In the scene, a slave in a deck complaining about the crowdedness. Part of Douglass's speech and most of his career are against slavery because he has lived through it and has suffered it. He was once in ships like these which were crowded.
This shows a slave in the north in the workplace having to be forced back to slavery. One thing Douglass mentions is that he is very angry with the fugitive slave act because it forced the north to support slavery.