Answer:
d. Americans increasingly shared a common and standardized popular culture.
Step-by-step explanation:
After the American Civil war, there are many ways in which americans tried to reconstruct America after the Civil War
Hence, the Americans showed how they are one undivided nation. By construct a new country out of the bitterly divided states. This ensure that they look for many avenues to which makes Americans to increasingly shared a common and standardized popular culture, so as to move the nation forward. From the North to Southern Union, they all eventually work together to achieve unity.