The danger of populism is that populist governments claim to do everything in the interests of the majority but they see the rights of the citizens as an obstacle for their goals, based in their beliefs. Some of these dangers might arise as racism and intolerance against immigrants.
The founders believed that the "division of power" in a federal system would ensure a less corrupt government.
This is explained on the power of supervision that each power must execute on the rest of them. It's an equilibrium of power.
28n-7=-38-3n
31n-7=38
31n=-31
n= -1
Ending slavery immediately would have had a devastating effect on the economy which had become dependent on cheap slave labor. It would have also motivated the South to secede. The slaves would have also been left without an immediate source of sustenance.