Final answer:
The start of the Bronze Age marked the beginning of the Shang dynasty in ancient China.
Step-by-step explanation:
The event that marked the beginning of the Shang dynasty was the start of the Bronze Age. The Shang dynasty emerged in ancient China around 1600 BCE, and it was during this time that bronze metallurgy became widespread. The use of bronze weapons and tools revolutionized warfare and agriculture, which greatly contributed to the rise of the Shang dynasty.
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