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The National Park Services wrote : The historic buildings along today 's Black Heritage Trail ® were the homes , businesses , schools and churches of a thriving black community that organized , from the nation 's earliest years , to sustain those who faced local discrimination and national slavery , struggling toward the equality and freedom promised in America 's documents of national liberty .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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