You can find additional free-response questions and scoring guidelines on AP Central, along with grade distributions and examples of actual students' responses and commentary that explains why the responses received the scores they did.
Multiple-Choice Questions
For sample multiple-choice questions, refer to the Course Description.
AP U.S. History Course Description (.pdf/625K)
Requires Adobe Reader (latest version recommended).
Free-Response Questions
2012 Free-Response Questions (.pdf/414K)
2011 Free-Response Questions (.pdf/712K)
2011 Form B Free-Response Questions (.pdf/1.8MB)
2010 Free-Response Questions (.pdf/389K)
2010 Form B Free-Response Questions (.pdf/825K)
2009 Free-Response Questions (.pdf/1.38M)
2009 Form B Free-Response Questions (.pdf/396K)
2008 Free-Response Questions (.pdf/229K)
2008 Form B Free-Response Questions (.pdf/235K)
2007 Free-Response Questions (.pdf/425K)
2007 Form B Free-Response Questions (.pdf/279K)
2006 Free-Response Questions (.pdf/183K)
2006 Form B Free-Response Questions (.pdf/174K)
2005 Free-Response Questions (.pdf/617K)
2005 Form B Free-Response Questions (.pdf/353K)
2004 Free-Response Questions (.pdf/400K)
2004 Form B Free-Response Questions (.pdf/150K)
2003 Free-Response Questions (.pdf/380K)
2003 Form B Free-Response Questions (.pdf/522K)
2002 Free-Response Questions (.pdf/821K)
2002 Form B Free-Response Questions (.pdf/7.16M)
2001 Free-Response Questions (.pdf/3.91M)
Scoring Guidelines
2012 Scoring Guidelines (.pdf/1MB)
2011 Scoring Guidelines (.pdf/250K)
2011 Form B Scoring Guidelines