The fourth of July is the day of freedom for the people of America. In the speech, Douglas comments on the celebration of the day and says that to celebrate such a day is very ironical. He says that the celebration of freedom which the people are celebrating is in reality still under slavery. Hopefully this helps :)
12 percent decrease between 2251.35 and 1975.86
It is the "National Labor Relations Board" that acts as a mediator in disputes between unions and employers, since many people on both sides of the dispute often claim that the other side is acting unjustly, especially when it comes to negotiations.
Very similar to Jesus' flip flop
The right to Life liberty and pursuit of happiness (meaning you are allowed to do what makes you happy)