Center of Military History Publication 70-101- 1.

Alliance politics is a regular headline grabber. When a possible military crisis involving Russia, North Korea, or China rears its head, leaders and citizens alike raise concerns over the willingness of US allies to stand together. As rival powers have tightened their security cooperation, the United States has stepped up demands that its allies increase their defense spending and contribute more to military operations in the Middle East and elsewhere. The prospect of former President Donald Trump unilaterally ending alliances alarmed longstanding partners, even as NATO was welcoming new members into its ranks. Military Alliances in the Twenty-First Century is the first book to explore fully the politics that shape these security arrangements – from their initial formation through the various challenges that test them and, sometimes, lead to their demise. Across six thematic chapters, Alexander Lanoszka challenges conventional wisdom that has dominated our understanding of how military alliances have operated historically and into the present. Although military alliances today may seem uniquely hobbled by their internal difficulties, Lanoszka argues that they are in fact, by their very nature, prone to dysfunction.

This book conceptualizes and examines theories of the 'Legal Pluriverse': the multiplicity of rules that regulate multinational missions and the diverse actors involved. The book sets out the various legal regimes, assesses how these rules interact, and exposes norm conflicts, areas of legal uncertainty, or ambiguous loopholes.

Alliances have shaped grand strategy and warfare since the dawn of civilization. Indeed, it is doubtful that the United States of America would have gained its independence without its Revolutionary War alliance with France. Such alliances may prove even more important to international security in the twenty-first century. Economic and financial difficulties alone will ensure that policy makers attempt to spread the burden of securing vital interests onto other nations through alliances, both formal organizations such as NATO and informal alliances of convenience as developed to wage the Gulf War in 1991. A team of leading historians examine the problems inherent in alliance politics and relationships in the framework of grand strategy through the lens of history. Aimed at not just the military aspects of alliances, the book uncovers the myriad factors that have made such coalitions succeed or fail in the past.