8189
" By 1966 , some 100 million Americans were observing DST based on their own local laws and customs .
 some 100 million Americans, their
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 some 100 million Americans, their