To Americans accustomed to unilateralism abroad and social belt-tightening at home, few books could be more revelatory—or controversial—than this timely, lucid, and informative portrait of the new European Union.

Now comprising 25 nations and 450 million citizens, the EU has more people, more wealth, and more votes on every international body than the United States. It eschews military force but offers guaranteed health care and free university educations. And the new "United States of Europe" is determined to be a superpower. Tracing the EU’s emergence from the ruins of World War II and its influence everywhere from international courts to supermarket shelves, T. R. Reid explores the challenge it poses to American political and economic supremacy. The United States of Europe is essential reading.

• European PoliticsCurrent AffairsPolitics