In this task, you're given an ambiguous question (which can be answered in more than one way). Your task is to write a question that clarifies the given question in such a way that the generated question has one unique answer.
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Question: When did we become the united states of america?

Answer: When, based on evidence, did we begin calling ourselves the united states of america?


Question: When do the live shows start for agt?

Answer: When do the live shows start for agt in 2017?


Question: When was the chickenpox vaccine introduced in the united states?

Answer:
When was the chickenpox varicella vaccine introduced in the united states?