What does the Bible's reference to Abraham living in "Ur of the Chaldaeans" around 2000 B.C.E.suggest about the book of Genesis?

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The reference to "Ur of the Chaldeans" suggests that Genesis was written or edited during or after the time the Chaldeans were prominent (around the 1st millennium BCE), which is much later than the time of Abraham (around 2000 BCE). This implies a retrospective view, indicating that the text might have been composed or finalized during a period when the Chaldeans were well-known, thus reflecting knowledge of a later historical context.

What Does the Bible's Reference to Abraham Living in "Ur