Eckert published six novels in his The Winning of America series that include accounts of frontiersmen and notable Native Americans. He conducted extensive research for his works — and inserted fictional dialogue for his historical figures. The series includes the six books below and is a perennial JSF best seller:
- The Frontiersmen
- Wilderness Empire
- The Conquerors
- The Wilderness War
- The Gateway to Empire
- The Twilight of Empire