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A champion of strict constructionism , states ' rights , and popular sovereignty , he supported Stephen A. Douglas 's Kansas – Nebraska Act as a means of addressing slavery in the territories acquired by the U.S. in the Mexican – American War .
 Stephen A. Douglas, Kansas
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
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Answer:
 Stephen A. Douglas, Kansas