Answer: Slavery became a national issue because it split the country into two groups due to each state's beliefs on slavery. To be more specific, the Southern states were pro-slavery, and the Northern states were anti-slavery. This caused a civil war between the two groups, which made Abraham Lincoln, the president at the time, abolish slavery.
I hope this helped!! :)
The correct answer for this question is this one: "B) widespread use of public transportation." Prior to WWII, people living in cities in the United States enjoyed widespread use of public transportation.
Here are the following choices:A) a housing boom.
B) widespread use of public transportation.
C) increasing quality of public housing.
D) improving air quality.
I pretty sure it Declaration of Independence
