Final answer:
The postwar era and the Constitutional Convention revealed sectional and class differences in the United States.
Step-by-step explanation:
The postwar era and the Constitutional Convention revealed and foreshadowed the existence and growth of sectional and class differences in the United States. During the postwar era, there were conflicts between wealthy property holders and poorer elements of the community regarding the Constitution. Historian Charles Beard argued that these conflicts could be seen in economic class terms, with urban Americans, rich and poor alike, in favor of ratification to promote commerce and business activity, while both rich and poor rural Americans opposed it. These divisions were also evident during the Constitutional Convention, where tensions arose over-representation and the concentration of political power.