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 :)
Answer:
the desire to spread European culture
An abundance of natural resources including Salt and Gold minerals.
George Washington was the most responsible for keeping the colonial army together.
David Wilmot prohibited slavery in the territory