What to read after Justin Morgan Had A Horse?

Joel's face suddenly lit up as if he had thought of something for the first time. He spoke now to the horse, as though he were the one that mattered. "Why, come to think of it, you're just like us, Bub. You're American! That's what you are. American!"
In 1791 a Vermont schoolmaster by the name of Justin Morgan comes home with a two-year-old colt named Little Bub. Taken as payment for an outstanding debt, the little colt doesn't seem like he is worth much, but the kindly teacher asks one of his students, Joel Goss, to train him. Joel knows the horse has great potential, and soon word about Little Bub spreads throughout the entire Northeast for his ability to outwork, outrun, outtrot, and outwalk any horse in the area.
This is the extraordinary tale of a little workhorse, who, after being born in obscurity, becomes one of the greatest breeding stallions of all time. In this true story Newbery Medal-winning author Marguerite Henry and artist Wesley Dennis celebrate the life of the only horse ever to establish a breed all by himself -- the Morgan.