This paper is a critical analysis of the conditions under which a decent world order is possible, an order in which the different peoples of the world can thrive under the conditions of peace, cooperation, freedom, justice, and prosperity. This analysis is done from the standpoint of Janusz Kuczynski’s philosophy of universalism as a metaphilosophy. More than any other in the contemporary period, this philosophy has advanced a focused, systematic, and comprehensive analysis of these conditions on the basis of a universal vision of nature, human nature, and the meaning of human life and destiny. The paper is composed of three parts. The first part is devoted to a short overview of activism in the history of philosophy. The second part is devoted to an analysis of the main elements of universalism as a metaphilosophy, especially the theoretical conditions of establishing a decent world order. The third part is devoted to a discussion of the practical steps that should be taken to establish a decent world order. Keywords: universalism, metaphilosophy, worldview, war, dialogue, human nature, peace.