The United States pavilion was also modest, a variation on the United States Capitol Building: the main U.S. presence was in the commercial and industrial palaces. One unusual aspect of the U.S. presence was The Exhibit of American Negroes, a joint project of Daniel Murray, the Assistant Librarian of Congress, Thomas J. Calloway, a lawyer and the primary organizer of the exhibit, and W. E. B. Du Bois.