US History Programs?

Pre-College Topics Summer Programs
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For research, take a look at the National Writing Board and the Concord Review:

http://www.tcr.org/nwb

See also:

http://talk.collegeconfidential.com/college-admissions/527787-national-writing-board.html

For internships, the NY Historical Society also has year-round and summer-only internships:

http://www.nyhistory.org/education/internships/high-school-internships

See also:

http://www.nahyp.org/awardees/student-historians-high-school-internship-program/

And the National Museum of American History at the Smithsonian has internships during the school year and summer as well (the summer deadline is February 1):

http://www.smithsonianofi.com/internship-opportunities/national-museum-of-american-history-internship/

Finally, the College of William and Mary has a pre-collegiate summer program in Early American History:

http://www.wm.edu/as/niahd/precollegiatesummer/index.php

Those should give you some starting options.