The greatest single factor to spur the amazing industrialization of the post-civil war years was
a. mining
b. the railroad network
c. the steel industry
d. agriculture

b. The railroad network

Explanation:

The construction of the U.S. railroad network allowed a faster movement of raw materials and goods throughout the American territory. This promoted a faster capital growth rate, and when capital is abundant, industry ensues.

Mining, the steel industry and agriculture are only specific sectors that benefited from the construction of the U.S. railroad network. It was the railroad network that boosted growth.

it is the code of hammurabi

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.