During the war, the country was very poor, and just by looking around, you could see many slaves hard at work doing something that most people now would be paid lots of money for. They were in charge of working in homes and in factories doing whatever their owners needed them to do. Often, they didn't make any money at all.
Now, you would imagine that one wrong move could put you in jail. Back then, the evil lived with you for the rest of your life. Some were tortured and killed, before they had a chance to explain.
As a slave, you weren't just responsible for working on factories. You may have other tasks like feeding sheep, caring for your owners, building ships, constructing bridges, and planting.
When a slave is reminded of "The 4th of July", it often makes most slaves sad as it is a reminder of their state of living and what they are going through. It isn't a celebration, because it becomes more of a curse, and reminds you of how heartless your slave owner can be.
No matter who you are as a slave, you are going to be horrified, and you are going to experience pain and grief. This is something that Frederick Douglass had to experience as a child.
Some slaves, not all, but some choose to cherish eveyr moment of their life. As a slave any moment could be your last as you could be tortured or killed for not pleasing your owner. As a slvae, you will be quiet and won't feel like talking to anybody, especially in the times of despair.