A few years back, I read several news accounts like this one from CNN that indicated that Americans, particularly those who fancy themselves experts on the subject, know vanishingly little about the United States Constitution.
This reading on James Madison and its accompanying vocabulary-building and comprehension worksheet will go only a short distance to ameliorate ignorance of the U.S. Constitution, but it will serve as a reasonable introduction to deeper inquiry into this quintessential document from the American Enlightenment.
If you find typos in these documents, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.