Answer:
The slave trade had devastating effects in Africa. Economic incentives for warlords and tribes to engage in the slave trade promoted an atmosphere of lawlessness and violence.
The big differences are that a juvenile is charged as a delinquent and has no right to a jury therefore is judge solely by the judge. Also while adults are charged and punished for their crimes, juveniles are usually put somewhere to rehabilitate.
The fears of the Anti-Federalists arose because the new federal government would have supremacy of the states when it came to legislation--making the Anti-Federalists believe that it would become a tyrannical body. The Constitution tried to put these fears to rest by implementing a system of "checks and balances", wherein no single federal body could become too powerful.