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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."

the democratic and republican parties

explanation:

a. by accepting the election of president abraham lincoln in 1860 and convincing other southern states to do the same

the structure was most likely used for;

c. playing a ball game with stone hoops