It allowed for steel to be produced much more cheaply and efficiently, This made steel more available so enough is produced to build skyscrapers.
e) sounds like the best choice.
South wanted slavery, rebellions because of Lincoln becoming president, John Brown's and other abolitionists actions, the consequences caused by Compromise of 1850, the consequences of the Fugitive Slave Act, and the controversy and Bleeding Kansas.
It’s actually 5 points not 10
