The People, Yes pt. 23 (1936). The popular form of this expression was crystallized when Charlotte Keyes published an article titled "Suppose They Gave a War and No One Came?" in McCall's, Oct. 1966.
Thomas Jefferson, Henry Augustine Washington (1854). “The Writings of Thomas Jefferson: Being His Autobiography, Correspondence, Reports, Messages, Addresses, and Other Writings, Official and Private : Published by the Order of the Joint Committee of Congress on the Library, from the Original Manuscripts, Deposited in the Department of State”, p.91
George Washington (1836). “The Writings of George Washington: Being His Correspondence, Addresses, Messages, and Other Papers, Official and Private, Selected and Published from the Original Manuscripts; with a Life of the Author, Notes and Illustrations”, p.367