I preamble this by saying that I did not work on "America the Story of US" but I have produced dozens of programs for The History Channel.
The following is a general response to some of the posts on this thread, and perhaps it will shed light on the general subject of cable documentary production.
1) Most networks do not produce the shows you watch on them. The shows themselves are produced by one of any number of productions companies across the country that produce for History, Dicovery, etc etc etc.
2) The Narrator does not write the script or detirmine what is said. They are actors, and are paid to read words.
3) Some producers know more about history than others. I pride myself on the details that get right on the shows I work on. Some know less. But there is one thing we all share; we're running on budgets that are not unlimited, we are running on schedules that do not always allow a surplus of time; television shows, good and bad, are hard to make. It is not work for the weak of heart.
4) Content - I saw someone use the expression "Wartoons". I think that's cute actually. But in all seriousness, I produced all of the episodes of "Battle 360" and "Patton 360" and wrote half of the episodes of both. I can tell you that as a result of so-called "Wartoons" a generation of video-gamming youths now know the names of "Enterprise", "Halsey", "Guadalcanal", "Patton", "Metz", etc etc etc. I can also tell you that these programs were popular with the veterans interviewed, etc etc.