Revolutionary improvements in technology combined with the leadership elite's enthusiasm for de-regulation of markets and free trade to fuel American-style globalization. The nation rose to economic power after the Spanish-American War, and won both world wars and the Cold war, after which America's power and cultural influence soared as business and financial interests pursued the long-term quest for global markets. But, the tragic events of September 2001 and the growing volatility of global finance, raised questions about whether the era of American-led globalization was sustainable, or vulnerable to catastrophic collapse.