After the Civil War, the United States: a - became more industrial
b - made advancements in communication and transportation.
c - grew to be one of the world's wealthiest countries.
d - All of the choices are correct.

D All of the choices are correct.

i guess it should be d option i en all of the above

could you give me the options ?

an economic reason that the south needed a reconstruction plan is that plantations, factories, and other businesses were destroyed during the war.