I especially like the ones that are American patriotic songs. That way you can play the music as well and march or play held held instruments.
What about some cute read, white and blue crafts?
A big puzzle would work well for US geography.
Here are some free historical coloring pages.
Teaching the kids about American holidays would be fun and informative.
What about planning an American patriotic parade with your students? They could wear read, white and blue, decorate a couple of wagons with streamers, carry different American symbols and sing patriotic songs. Your students could parade around the school building and the older kids could come out of their classrooms to enjoy the parade.