In the election of 1848 the major parties were forced to take stand on slavery because the Free Soil Party, and the fact that slavey was the most highly contested issue in the US.
The answer is C. Oh, and I found a resource to back it up:
A. at St Louis ,Missouri River, Columbia river ,Pacific Ocean
Answer:
MLK AND RFK: VIOLENCE AT HOME Destruction in Washington, DC, on April 8, 1968, four days after the assassination of Dr. Martin Luther King Jr. ... Anger, protest, and violence erupted in cities across the United States following the death of the civil rights icon.
I'm pretty sure it is the Harlem Renaissance
