From Ally to Enemy: The XYZ Affair and а Diplomatic Crisis in the Franco-American Relations

The XYZ Affair was the most significant political incident during twenty years of the Franco- American alliance (1778–1798). It was the leading cause of the diplomatic crisis and the Quasi-War in relations between two countries from 1798 to 1800. Based on sources such as treaties, monographs, and other documents from the American side which are related to the topic, the article aims to analyze the crisis in Franco-American diplomacy after twenty years of establishing the alliances through the XYZ Affair and the Quasi-War. The study focuses on presenting the breakdown of trust in the Franco-American relations that led to the emergence of the XYZ Affair; the diplomatic crisis in the Franco-American relations known as the XYZ Affair and the Quasi-War between both countries and efforts of two countries to find a peaceful solution. The research shows that the XYZ Affair had been the biggest conflict case in the history of the Franco-American relations since 1778. In fact, America’s interest and honour in the XYZ Affair was the fundamental cause leading to the severe crisis in relations between two countries. The article contributes to clarifying the history of the XYZ Affair, the Quasi-War, the Franco-American relations, and a part of American diplomatic history in the first half of the founding era of the United States.