While there are many online pedagogical tools for high school teachers to use in the classroom, there are relatively few that allow these educators the ability to create cost-effective professional development seminars for themselves and their colleagues. The National Humanities Center has developed these helpful toolboxes, which can effectively "fit into tight school calendars and equally tight budgets." The toolboxes currently available online deal with the experience of the American Revolution and sectionalism in the United States from 1815 to 1850. Each toolbox contains a structural outline of the materials, a general timeline of events, topic framing questions, and important suggestions for how best to run each development seminar. Most importantly, the toolboxes have been created and tested by professors, teachers, and the educational program staff of the National Humanities Center. Additionally, the site notes that seminar toolboxes on The Making of African-American Identity: 1865-1915 and The Gilded and the Gritty: America, 1877-1920 will be made available in coming years.