across the North American continent and acquired a number of overseas possessions. The three major traumatic experiences in the nation's history were the American Civil War (1861-65), the Great Depression of the 1930s and the distruction of the World Trade Center in 2001. Buoyed by victories in World War I and World War II and the end of the Cold War in 1991, the US remains the world's most powerful nation-state. The economy is marked by steady growth, low unemployment and inflation, and rapid advances in technology.
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