A. Our republic is a representative democracy. Derp.
B. "We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.".
C. Government of the people, by the people, for the people".
Abraham Lincoln.
D. The United States was founded as a democracy. It continues to be a democracy and will always be a democracy no matter how many times you treasonous bastards try to change it.