A political party is basically how the election is, you have two different parties (Democrat & Republican) both have two different views on how the government should be lead.
So your answer is A, there's a website i can recommend if you'd like
"<span>Christianity immediately spread around the world" would be the best option, since the power and size of the Roman Empire was so great that people felt as though they didn't have to fear persecution. </span>
C. He blamed jews for the ills of germany
Although the North and the South disagreed on all these things at some point, it was primary the disagreement over the spread of slavery that defined this era in the US.
Please correct me if I'm wrong!! :)