Any role? Of course. Countries are interconnected, so the actions of one will impact others. We have an out-sized impact because of our economic and social (one might even say, moral) leadership. For all of the concern about American involvement overseas, we've built places into world economic players. South Korea. Postwar Europe. Japan. Taking further into the developing world, our contributions to the global economy (exported manufacturing jobs) have helped bring other economies opportunities that they'd never have gotten on their own. Is the Middle East better off economically without the United States? Does anyone think that? What those countries have chosen to do with that wealth and opportunity varies wildly from state to state. I don't think it is correct to deny those countries agency in their outcomes.