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W.H.H. Clayton had two other older brothers : Thomas Jefferson Clayton , who remained in Pennsylvania and became a judge of the Court of Common Pleas in Delaware County , Pennsylvania ; and Powell Clayton , who became a Brigadier General in the Union Army during the Civil War and served as , first , Governor , and then Senator , for Arkansas after the War and finally , as the American ambassador to Mexico .
 Clayton, Jefferson Clayton, Delaware County, Powell Clayton, Union Army, Arkansas
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Clayton, Jefferson Clayton, Delaware County, Powell Clayton, Union Army, Arkansas