Problem: At a time when the nation's industry had to expand to meet the need for supplies and weapons, the
workforce grew smaller, creating a labor shortage.
Solutions:

i need to see the answer to answer the question

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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a marriage ending by the death of a husband or wife.

explanation:

i don't see your choices but i'm just gonna give you my answer.