Public Opinion and 20th-Century Diplomacy explores both the influence of public opinion on diplomatic decision making in international history, and its emergence as a legitimate field of study for international historians.The book uses five case studies to examine the impact of public opinion on the "high" politics of diplomacy. Incorporating a variety of methodological approaches, the book looks at:-British policy at the Paris Peace Conference-French policy in the era of 1930s appeasement-Policy choices of the US during the Vietnam War-Global responses to apartheid-era South Africa-Public attitudes across the EU regarding European integrationThis book demonstrates the vibrancy of public opinion research to date and the possibilities for future lines of study.