An understated but useful site featuring various lesson plans for Social Studies for all grade levels and topics.
To the left, you will find a tab that says "American History." By selecting the desired time period, you will find various lesson plans on topics throughout American History. Also on the left are tabs leading to maps, activities, games, and other classroom resources.
Features several lesson plans from all areas of history.
I have bookmarked several specific lesson plans from this list (below), but various other US History lesson plan ideas are available here.
A site which gives ideas of how to incorporate technology into history lessons.