I want to know the answer to the following question:
What happened in Philadelphia in 1856?
All the background I'm provided with is that "From the American Civil War until the mid-20th century, Philadelphia was a bastion of the Republican Party, which arose from the staunch pro-Northern views of Philadelphia residents during and after the war (Philadelphia was chosen as the host city for the first Republican National Convention in 1856).". Is that enough to answer the question?
Answer: yes