There is a very strong argument that crochet did not exist before about 18001 so you don't see crocheted items at Colonial Williamsburg. However, at Basset Hall, which was a home for John D. Rockefeller Jr. and his wife beginning in 1936 (and is now a part of Colonial Williamsburg,) I found two crocheted pieces. One elaborate and another extremely simple.
The picture above is a crocheted bed covering decorating one of the guest bedrooms and these are close-ups of the two motifs.
If anyone knows the history of this bedspread or information about the pattern I'd love to hear about it.
The last room we toured at the Basset House was the kitchen and my eye caught this as we were leaving -- a crocheted dishcloth! It looks like worsted weight cotton thread and rows of single crochet (but it looks a little different than that -- any ideas?)
1Crochet and its Origins -- FAQ