The 2023 theme book explores the theme of Frontiers in History: People, Places, Ideas and contains topic ideas and classroom resources from NHD and NHD partners.

Purchase the 2023 Theme Book
Related Resources

Silent Heroes: Untold Stories of the Korean War

July 22, 2025

Exploring the U.S. Census and its Historical Insights

July 22, 2025

Support the teaching and learning of history

Your support of National History Day is an investment in the future

donate today

Judges needed

Judges make the NHD contest possible. See how you can provide students a high-quality educational experience 

Register as a contest Judge

Attention teachers: Apply now for one of NHD's 2025/2026 Silent Hero professional development programs! Applications are open through Wednesday, August 13.

Learn more and apply now.

This will close in 0 seconds