In recent years, the US has seen its public popularity ratings around the world plummet under the presidency of George W. Bush, and subsequently soar upon the election of Barack Obama. The issue of anti-Americanism has received considerable attention from policy-makers, pundits and scholars alike. It is perhaps surprising then that systematic empirical studies of its consequences are still few and far between. Drawing from a wealth of research data, interviews and surveys of social media, this book directly examines pro- and anti-American views and asks what we can learn about the nature and impact of world opinion. By treating anti-Americanism as a case study of public opinion at work, Professor Datta reveals how we can better understand the relationship between global citizens and their political leaders, and concludes that anti-Americanism does in fact substantially impact US security, as well as its economic and political interests.