Answer:
<h2>Bronze.</h2>
Explanation:
<em>The Shang Dynasty is the oldest Chinese dynasty that have been found by archaeologists. </em>They biggest contribution was their work with bronze, they made a lot of crafts, like vessels. They considered the bronze as a treasure because allow them to do ornamental stuff, but also to craft weapons for military, since that they were continuously in wars.
They had an advance society, surrounded by walls to protect themselves from Barbarians. Also, they had a strong politics and military power. According to archaeologists, they were the first using two-wheels cars and horses to achieve larger distances in shorter periods of time, which gave them a big advantages over others armies.
