(1) why was the period during james monroe's presidency called the era of good feelings? new england merchants began importing luxury goods into the united states. james monroe won the presidency with out opposition. political parties stopped arguing, mostly everyone aligned with the democratic-republican party, and there was a period of national unity. (2)how did the war of 1812 affect the nation? all of the below answers the american territory was open to settlement after the british pulled out of the american northwest removal of the british navy's blockade of america spurred the growth of american manufacturing. the united states became more economically self-sufficient. what is the main role of the supreme court in interpreting the law? the supreme court determines whether laws are constitutional or unconstitutional the supreme court oversees the work of the legislative and executive branches. the supreme court serves as a resource to the state court system.