Legislatures, and courts are the most effective anvenues for defending and expanding our rights and liberties
Manifest Destiny was basically the idea of expanding the United States westwards. The term was coined in 1845 by a newspaper editor named John Louis O'Sullivan.
Generally speaking, while Alexander Hamilton supported merchants, Thomas Jefferson was more sympathetic toward the needs of "farmers", since Jefferson's view of the US was highly agrarian.
They present legal beliefs which present another point of view and additional information that aides interest groups.
It began to break down because it was only a temporary solution to the problem. The next time that slavery and new states came into question, the compromise became irrelevant because a new one had to be found to solve the issues with places like Texas and New Mexico, and California, and things like that.