The challenges that the nation faced after the Civil War was money
The answer is A) it gained better building materials from the steel industry, because in the second industrial revolution, the invention of steel provided a strong, easy-to-produce material. Railroads were rapidly expanding, and were using up lots of resources to be built. Steel production started to help the railroad system, since it became one of the major materials used for construction of railroad tracks.
D) not citizens.
Hope this helps.
#1 1712 – First steam engine is invented. ...
#2 1757 – British victory in the Battle of Plassey. ...
#3 1764 – Invention of the Spinning Jenny. ...
#4 1771 – Richard Arkwright opens his first factory at Cromford. ...
#5 1789 – Samuel Slater leaves for America. ...
#6 1794 – Eli Whitney patents the cotton gin.
The factor that did not contribute to industrial revolution are the people who wanted to maintain feudalism to stay in power. I think the landlords who are used to this system and did not try to adapt wouldn't want that significant change.