Hi Candace :),
My absolute favorite resource is Hands and Hearts History Discovery kits. We've used both the Early American and Westward Expansion kits. We learned quite a bit from just using the kits, lots of information and authentic crafts and activities.
We also did an American Girl Co-op with crafts from some of the books, I think. It was lead by another family so I wasn't involved with the planning. The kids had pretend barn raising with popsicle sticks, made berry dye, sewed quilts, etc.