World War, 1914-1918 --- African American soldiers --- African Americans --- Racism --- Afro-Americans --- Black Americans --- Colored people (United States) --- Negroes --- Africans --- Ethnology --- Blacks --- African American military personnel --- Afro-American soldiers --- Negro soldiers --- Negroes as soldiers --- Soldiers, African American --- Soldiers --- Participation, African American. --- History --- Social conditions --- United States. --- U.S. Army --- US Army --- African American troops --- United States --- Race relations. --- Race question --- Participation [African American] --- Race relations --- 20th century --- United States. Army --- Black people