In the roman republic during times of crisis or emergencies. a. a king was elected b. a dictator was appointed c. a parliament was created d. martial law was enacted

The correct answer is option b. "a dictator was appointed".  In Roman Republic a dictator was a magistrate that had absolute authority over the state. During that era, a dictator was appointed to rule the Republic to deal with military emergencies, crisis or to undertake specific duties.

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

union: everything else