Question: When did Afghanistan join the group of 193 sovereign states that is the world's largest intergovernmental organization?
Sentence (from "List of political entities in the 7th century BC"): The earliest known primary states appeared in Mesopotamia c. 3700 BC, in Egypt c. 3300 BC, in the Indus Valley c. 2500 BC, India c. 1700 BC, and in China c. 1600 BC.
Relevant evidence: No