Why History Matters
Howard Zinn's A People's History of the United States
APUSH Curriculum Frameworks (large PDF document)
Political Parties Timeline graphic
Excellent visual of all political parties and elections; zoom in to read
Presidential Elections
Each election is show via a color-coded map of the US
Videos
Crash Course: US History
This link has a list of all videos in chronological order
Jocz Productions
Overviews of the historical periods with visuals
Study Guides
Gilder Lehrman AP US History Study Guide
Excellent quality source with timelines, videos, and primary and secondary sources
EXAM Review
http://www.tomrichey.net/apush-review.html
Trying to sell you stuff, but plenty of free review material is available
https://www.albert.io/ap-us-history
Practice questions and key terms for each period
http://faculty.polytechnic.org/gfeldmeth/lecturesok.html
Outlines and Charts of major historical events