How did industrial production in the United States change following World War I?

It improved weaponry which helped turn the tide of war. It also kept things moving when many men had to leave.

answer; /// i believe that the correct answer is (d)the huang he river valley;

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."