I also have a son who is fascinated with Ancients and American history. He wants to study both and it's hard to refuse him!! I am totally inexperienced but have been grappling with a number of ideas . . . . I think (and again this is PURE speculation :)) that at this age we should do one of two things (for us this would be for second grade - we have been challenged in figuring out our "path" and have recently devoured books like the Well Trained Mind and Latin Centered Curriculum which have been inspiring):
1. Use My Father's World Adventures and just have fun with American History and start a chronological study of history a little later. Adventures seems like a very appropriate amount of material and challenge for a 2nd grader and with the addition of a variety of books to read would be plenty of challenge. It would definitely satisfy my young son's thirst for knowledge of America. He could continue to read about Ancients on the side and listen to SOTW or MOH audios.
2. OR study history the WTM way (which is my first love) BUT dabble in American on the side via reading great books (have looked to MFW, WP, BF, HOD for ideas here) and perhaps using other resources (videos, audio books). I think the American studies would be an "on the side" thing for my reader/s rather than something I "teach".
I realize that following the chronological study of history will give us plenty of focus on American History in context which is very appealing. However, we also don't want to wait that long to expose our kids to some of our nation's history (the more fun stuff that appeals to their little hearts and minds - pilgrims, famous presidents, American symbols like the flag, Statue of Liberty, etc.).
So many wonderful things to study, books to read, etc. and so little time, right?! I don't think there's any harm in doing it your own way as long as you aren't completely overwhelming yourself or your kids which is why there should probably be a "main" focus and then a "side line or stream" that is driven by the reading child (who can read on his/her own). I have agonized over this very issue (multi stream or two-stream) and I continue to . . . . :lol: