If a nation expects to be ignorant and free, in a state of
civilization, it expects what never was and never will be.
Thomas Jefferson, 1816.

This is a good place to start. You will find lots of good stuff in plain English that is not taught in law school. Warning: If you are an idealistic sort of person who tends to side with freedom for the people, then this site may be your government's worst nightmare, especially after you read about jury duty, what the legal difference is between being one of the people of the country and one of the citizens, and why we pledge allegiance to the Republic instead of a democracy.
"Each  time  a  man         stands up for an
ideal, or acts to improve      the  lot  of  others, or
strikes out against injustice, he  sends  forth a tiny ripple of
hope, and crossing each other from a million different centers
of energy and daring, those ripples build a current which
can sweep down the mightiest walls of
oppression and resistance."
Robert F. Kennedy
June 6th 1966