The war changed the traditional gender roles for women enlisted in the armed forces and how they took jobs outside their homes.
Answer:
B. A religious Revival
Explanation:
The Second Great Awakening was a religious movement in the United States that lasted from the late eighteenth century until the middle of the nineteenth century. While it struck many parts of the country, the Northeast and Midwest were particularly hard hit.
There were many such things, for example, systematic racism. African-Americans were still living in poverty or didn't have civil rights and segregation was strong. They could only join white communities if they were musicians or things like that where they would have to play for white guests of parlors. It wasn't until the 60s that the African-American people were given their civil rights.
Increase in school population led to the other three.