We have argued that a proper understanding of our world must entail an analysis of power relations within and between states, even in this era of economic globalization. Power has economic, political, and ideological elements, and it can be exercised coercively or created by a collectivity. Institutions freeze power relations in different ways, and in different times and places. But historical change is so pervasive that what seems permanent often proves to be transitory, leading to the creation of new combinations designed for altered conditions. How could any of this be otherwise? After all, the interactions between states have helped structure the world throughout much of human history. We see no reason to believe that this will change.