North–South divide
Wallerstein also stated that another major influence on his work was the "world revolution" of 1968. A member of the faculty of Columbia University at the time of the student protests, he participated in a faculty committee that attempted to resolve the dispute. He argued in several works that this revolution marked the end of "liberalism" as a viable ideology in the modern world system. He also argued that the end of the Cold War, rather than marking a triumph for liberalism, indicates that the current system has entered its 'end' phase: a period of crisis that will end only when it is replaced by another system. Wallerstein anticipated the growing importance of the North–South divide at a time when the main world conflict was the Cold War.