Here’s my incredibly biased list. 🙂
For Gov, we read:
The Everything American Government Book (not a brilliant work, but it covers the basics)The 5000 Year LeapCivil Disobedience by ThoreauThe Law by BastiatFederalist Papers & Anti-Federalist PapersThe Communist ManifestoAnd we re-read the Maybury gov booksWe have Written on the Heart: The Case for Natural Law, but I don’t think he got to it.
For Econ, we read:
Life of Fred Economics–it’s surprisingly detailedThat Which is Seen by Bastiatre-read the Maybury Econ booksAnd again, we have New Ideas from Dead Economists, but I don’t think he got to it, or to The Essential Adam Smith.www.mises.org has many free books from an Austrian perspective.
ETA: Economics in One Lesson. Oldest read it in middle school, but it could work for high school, too.