Today more than ever, the world is marked by violence, crime, and power struggles. Conflicts and wars continue to claim the lives of millions of people, fueling a global sense of insecurity and a deep desire for peace. Can we hope for the advent of lasting peace?Through theoretical and practical reflection, Kant proposes a rational principle of law based on universal rules. This principle, he argues, constitutes the foundation of any civil constitution and the condition for lasting peace among states, particularly within the framework of a federation of free peoples.However, in response to criticisms directed at a monolithic rationality based on domination and a monopoly on meaning, this study highlights the need for a peace grounded in pluralistic rationality. Such a rationality values intersubjectivity, freedom, and dialogue between cultures, thereby paving the way for the ongoing construction of a world capable of overcoming its own contradictions.