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when does the kingdom divide into israel and judah
Around 930 BCE, the Kingdom of Israel as a united monarchy split into two kingdoms: the Kingdom of Israel in the north and the Kingdom of Judah in the south.
did the kingdom of israel as a united monarchy actually exist
In contemporary scholarship the Kingdom of Israel as a united monarchy is generally held to be a literary construction and not a historical reality.

Question: why is the kingdom generally held to be a literary construction
Self-contained rewrite: why is the kingdom of israel as a united monarchy generally held to be a literary construction