If Obama’s speech turns out to mark the start of a new era of progressive politics in America, it would fit a pattern explored by one of America’s great historians, Arthur Schlesinger, Jr., who documented roughly 30-year intervals between periods of what he called “private interest” and “public purpose.”
如果奥巴马的演说真的成为美国新进步政治时代的开端，则这将契合伟大的美国历史学家小亚瑟·施莱辛格（Arthur Schlesinger, Jr.）所探索的路径：他指出，美国存在“私人利益”和“公共目标”的交替，每个时期大约30年。