One thing you need to know about is Jeffersonian Democracy! It is always on the APUSH Exam. This book follows Thomas Jefferson and his politics. You will get an inside look to Jefferson and his ideals. Fantastic read!
Here is a great website about Jeffersonian Democracy and a passage from it:
"Our final assessment of Jeffersonian Democracy rests on a profound contradiction. Jefferson was the single most powerful individual leading the struggle to enhance the rights of ordinary people in the early republic. Furthermore, his Declaration of Independence had eloquently expressed America's statement of purpose "that all men are created equal." Still, he owned slaves all his life and, unlike Washington, never set them free.
For all his greatness, Jefferson did not transcend the pervasive racism of his day"
NY Times Review of the book Link: