Answer:
Slaves were used for labour, as well as for amusement
The main way in which popular sovereignty applied to federalism is that it allowed settlers of new land to determine whether this new territory would be "slave" or "free", meaning that the states a large amount of power as well as the federal government.
the bill of rights was added as a compromise to protect the "natural rights" of the people who had just escaped a rule of someone who didn't respect these rights.
it took so long because people couldn't agree on what the rights should be.