Immanual Wallerstein develops a theoretical framework to understand the historical changes involved in the rise of the modern world. The modern world system, essentially capitalist in nature, followed the crisis of the feudal system and helps explain the rise of Western Europe to world supremacy between 1450 and 1670. According to Wallerstein, his theory makes possible a comprehensive understanding of the external and internal manifestations of the modernization process during this period and makes possible analytically sound comparisons between different parts of the world.