Read the excerpt from Up from Slavery by Booker T. Washington.

One-third of the population of the South is of the Negro race. No enterprise seeking the material, civil, or moral welfare of this section can disregard this element of our population and reach the highest success. I but convey to you, Mr. President and Directors, the sentiment of the masses of my race when I say that in no way have the value and manhood of the American Negro been more fittingly and generously recognized than by the managers of this magnificent Exposition at every stage of its progress. It is a recognition that will do more to cement the friendship of the two races than any occurrence since the dawn of our freedom.

What evidence does the author use to support the claim that no one can disregard Black citizens and be successful?

Black citizens make up a significant portion of the population.
Ensuring material and moral security for Black citizens will lead to success.
Recognizing the worth and power of Black citizens will bring people together.
The successful convention directors recognize the value of Black citizens.