Which of the following triggered the second industrial revolution?

a. geologists discovered vast quantities of petroleum in germany
b. entrepreneurs figured out how to extract coal much more efficiently
c. innovators figured out how to produce steel cheaply
d. engineers developed a much faster steam engine

I think its:

C. Innovators figured out how to produce steel cheaply

the emancipation proclamation was the aim of the war change to include the freeing of slaves in addition to preserving the union. the 13th amendment, which abolished slavery in the u.s. was passed on december 6th 1865.

as promised, lincoln waited to unveil the proclamation until he could do so with success from the union military advance. on september 22nd 1862, after a victory at antietam, he publicly announced a preliminary emancipation proclamation, declaring all slaves free in the rebellious states as of january 1st 1863.