Voices of Freedom (978-0-13-236628-1) by Bill Bliss.
At CATESOL, I was able to pick up the
Voices of Freedom Activity & Test Prep Workbook (978-0-13-286206-6) and my students love it, especially the quizzes about the N-400 sections
Also check out the article, Talking Turkey about Thanksgiving and Citizenship Prep by Bill Bliss. I likes his links to the Plimoth Plantation and Wampanoag Homesite..