Important things not to miss in US history

[momof2boys]

I was wondering if anyone knows of a site that list the important things not to miss when studying US history? I know the majority of them but I want to make sure I do not miss anything as I am preparing US history study for my son this next school year.
Thanks,
gloria

[Michelle in AL]

I always like to look at the AP Central Course syllabi, teacher's guides and other information to figure out where my emphasis on teaching should be. Here's a link:
http://apcentral.collegeboard.com/apc/public/courses/teachers_corner/3501.html