Explanation:
Slavery, condition in which one human being was owned by another. ... a perceived labour shortage, for otherwise it is unlikely that most people would bother to acquire or to keep slaves.
Conventionally, each state receives in the electoral collage THE NUMBER OF ELECTOR THAT IS EQUAL TO THE TOTAL NUMBER OF SENATORS AND REPRESENTATIVES IT HAS.
An exception is Washington DC, which always has the same number of electors as that of the state that has the least population of people in US.
Answer: Athens, Greece
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