1505
The court further ruled that slaves could never obtain U . S . citizenship and that Congress had no power to limit the expansion of slavery , as it had done in the Missouri Compromise .
 U . S ., The court, Congress, it, slaves
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 U . S ., The court, Congress, it, slaves