Here's a list of resources I recommend in continuing your history education.
The Dawn's Early Light by Walter Lord
This Land is Their Land by David Silverman
The Quiet Trailblazer by Mary Frances Early
Ghosts of Gold Mountain by Gordan H. Chang
Brother Gardeners by Andrea Wulf
Founding Gardeners by Andrea Wulf
The Curious Mister Catesby by E. Charles Nelson
John Clayton: Pioneer of American Botany by Edmund and Dorthey Berkeley
How the South Won the Civil War by Heather Cox Richardson
Fateful Lightning by Alan Guelzo
Robert E. Lee and Me by Ty Seidule
I can attest that the following have great on-site and on-line resources!