Which two nations turned to policies of isolation by the 17th century? a. india and java b. china and japan c. portugal and spain d. the netherlands and safavid persia

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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."

many women had to remain at home while husbands found work.

explanation:

a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.