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精编密训教材，分阶快递。Domino theory
The theory that if any nation fell to communism, the surrounding nations would likely fall as well. Expounded by Dwight D. Eisenhower, the domino theory served to justify U.S. intervention in Vietnam.
Stephen A. Douglas
Rose to national prominence as Speaker of the House, when he pushed the Compromise of 1850 through Congress. Douglas was the leading Northern Democrat of his day, a supporter of popular sovereignty and the author of the Kansas-Nebraska Act. He battled Abraham Lincoln for a seat in the Senate (successfully) in 1858, and for president (unsuccessfully) in 1860.
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