In the area of government, you'd already be studying the signers of the Declaration of Independence through Rev. to Rev. and reading the Declaration of Independence. Plus, the history readings already in Rev. to Rev. would discuss government concepts too. There is also the full-blown 50 states study that also fits well in this area. So, to finish out the government credit, it would make sense to add something like The 5,000 Year Leap for government and alternate reading a chapter of that with reading some of the The Federalist Papers. If you don't have time to read all 85 of The Federalist Papers, just read some of them! Each is an individual paper. If your child also read the Constitution, this would all add up to a semester of government credit (.5), when used in conjunction with what you're already covering within Rev. to Rev. Listing the Declaration of Independence, the Constitution, some of the Federalist Papers, the research on the Lives of the Signers, and the 5,000 Year Leap, you would have a strong high school government course.
Which looks like a great idea.

Do you think these choices would be appropriate for a 9th grader to add in for a government credit? Thanks!
