"To fulfill the dreams of one's youth; that is the best that can happen." So said Willa Cather in 1927. "Uh huh. Ever actually, like, try it?" is Kathleen Schmitt's response. Her dream to ride a horse across America was born on Horst and Harriet Haenert's horse farm in northwestern Illinois. Harriet suggested one of their horses might not winter well at all. Kathleen, freshly graduated from high school, suggested sending him to Harriet's sister in...