The books were written by a number of different authors, each writing from one to seven of the books; the authors included Benjamin Appel, Jim Kjelgaard, Earl Schenck Miers, William O. Steele, and others.
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The historical consultants were typically college professors or, in the case of war-related stories, retired military officers; among the more noteworthy consultants for the series were the historians Bruce Catton, Walter Prescott Webb and A. B. Guthrie, Jr..
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The series consists of 36 titles, first released between 1955 and 1963 by Grosset & Dunlap.