This article identifies, inductively through factor analysis, groups of nations linked together by relatively high levels of mutual diplomatic representation. Some theories of international politics hypothesize that nations will maintain high diplomatic exchange with states with whom they share...

According to most analyses, Japan's decision to attack the United States at Pearl Harbor in 1941 can only be explained as an act of irrationality, given the difference in relative power of the two nations. This article contends that for most purposes of analyzing national decision-making the...