The began in 1871 and continues today as a leader in professionalizing police officers and police agencies.

The best answer for this statement would be:

Police Force

The character and training of the police force that we know today, derived from a municipal police officers that after the civil war, had incorporated their character and training to the police force til’ the present.

Explanation:

The Police Force began in 1871 and continues today as a leader in professionalizing police officers and police agencies.

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."

confederacy: supported slavery, believed states should be able to nullify federal laws, supported low tariffs

union: everything else