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A handful of small U.S. companies are struggling to develop the technology to build the screens for the thin , high - quality televisions that are expected to hang on living room walls by the end of the 1990s .
 geographical social political: U.S.; date: the end of the 1990s
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: 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} 
 Entities: U.S., the end of the 1990s 
Answer:
 geographical social political: U.S.; date: the end of the 1990s