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For instance , in the '70's , mergers of US steel mills directly led to the birth of a few large - scale unified steel companies , but these companies also faced serious threats from small - scale steel mills , which are flexible in operation and advanced in technology .
 the '70's, US
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 the '70's, US