One of the major accomplishments of the Shang dynasty was .isolated China from the rest of the world.
ending the flooding of the Chang Jiang river
providing government help to people in need.
developing a monotheistic religion in China.

providing government help to people in need.

Explanation:

One benefit was the Shange gave help to people who needed it most.

answer - providing government help to people in need.

norsemen from northern countries had made earlier journeys

they wanted the u.s. to fight on the side of the central powers.