Please provide an essay with the following questions with references.

A. What did Thomas Jefferson, then Secretary of State, have in mind when writing for this country's Bill of Rights where the frontier was the end of Massachusetts, Pennsylvania and Georgia (among the thirteen colonies) and hostile British, French, Indian and Spanish armies surrounded the small states.

B. What is "precedent" in interpretations by the Supreme court. Look at how the Supreme Court looked at the right to bear arms in the a 1878 decision involving US vs Cruiksank and the much more recent, and in this professor's opinion, decisive, Heller vs The District of Columbia which allow citizens to carry handguns,

C. What weapons are prohibited now? With Columbine, Aurora, and most tragically perhaps Newtown School and the most recent rampage of LEGALLY purchased guns in UC Irvine, should these decisions be re-examined?