Has,have each of the children gone home

Has

Explanation:

Has each of the children gone home?

Author's inclusion of the feud between W.E.B Dubois and Booker T. Washington contributes to the central ideas of the article.

Explanation:

Both 'W.E.B Dubois' and 'Booker T. Washington' were blacks and they fought for the rights of African Americans. Though they had different phillosphies during the Civil rights movement.

Booker believed in economic independence for the blacks and said that they should receive education and then get equal rights. He was more passive thinking that all these things take time.

Dubois said that regardless of education, African Americans should first get their rights and he demanded things aggressively.

Thus, this feud contributes to the central idea of the article.