During school industrial revolution which building material became one of the most important in the world

During the Second Industrial Revolution, steel became one of the most important building materials in the world.

I believe its either Railroads since at the time iron was being used alot or the use of machinery

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.