Climate change caused the collapse of the Moche state around AD 600.

Evidence

There are no written records to tell us why, but the best bet seems to be climate change. … Whatever the cause, in the decades around AD 600, the Moche state and civilization collapsed. — Neil MacGregor, A History of the World in 100 Objects, 764

Categorization

• corroborated: 2 independent passages support this claim — Neil MacGregor, A History of the World in 100 Objects, 764