How does washington conclude that the graduates of tuskegee normal and industrial institute will influence america?

They will radically change American industry through their exceptional training.  Apart proper proportion between students and teacher ratio in class, their program is focused on the needs of the people who will benefit from it.  They are saying that not only does their program offer everything that students need in that particular field but also trains so that they apply their knowledge and skills excellently to their chosen career as their aim to mold and educate students who have the skills as well the emotional and mental capacity to succeed in life.