I think the answer is b. D is what both the North and the South agreed to which was the 3/5ths compromise
Missouri, and Maine both requested to become states, both wanted to be free, but Missouri ended up being slave, causing a battle known as the "burnt district" which was due to Jayhawkers of Kansas flooding into Missouri to vote pro-slave, making the polls artificially swell in support of slavery.
It is inefficient costing over 1 million us dollers
I believe it was the 15th century
