The term “era of good feelings” refers to the period of american history when:
a. americans united across party lines to declare war on great britain in the war of 1812.
b. there seemed to be political harmony during the monroe administration.
c. slavery was gradually abolished in all the states.
d. the federalist party was at its strongest.
e. democrats and whigs cooperated to solve the nation’s financial crisis.

b. there seemed to be political harmony during the Monroe administration.

Explanation:

The “Era of Good Feelings” is the term that is used to refer to the period of the term of President James Monroe from 1817 to 1825. 

During this period the country was ruled by the Democratic-Republicans of Monroe party. The term was used because it was a period of stability following the economic problems of the James Madison administration and despite the name, there were a series of problems in the country such as the crisis in slavery with the passage of the Missouri Compromise.

the answer would be a i think?

they became hereditary because there weren't many jobs for people in lower classes