Title: Ultimatum
Description: An early example of ambitious science fiction in which atomic physics and aeronautic technology are used to bring about world peace and remove the immanent  threat of global warfare (<a href=http://isfdb.org/cgi-bin/ea.cgi?1133>ISFDB</a>).  Amusingly, although set mainly in the USA, measurements are given in the metric system, which a footnote in Chapter III states was adopted in the USA in 1929.  Curiously, I believe the USA was the second nation after France to officially adopt the metric system, but the adoption was, of course, ineffectual.