Book excerpt: Though the participation of France in the American Revolution is well established in the historiography, the role of Spain, France’s ally, is relatively understudied and underappreciated. Spain's involvement in the conflict formed part of a global struggle between empires and directly influenced the outcome of the clash between Britain and its North American colonists. Following the establishment of American independence, the Spanish empire became one of the nascent republic's most significant neighbors and, often illicitly, trading partners. Bringing together essays from a range of well-regarded historians, this volume contributes significantly to the international history of the Age of Atlantic Revolutions.