Answer:
Railroads used the iron to build railroad tracks but iron was weak and also dangerous. Soon people then realized that steel was a better material for tracks because it was able to hold more weight which then allowed heavier cargo. Railroads also transported mineral needed to forge steel.
Explanation:
I'm not sure what your asking but after the vice president the speaker of the house becomes president
The revolution of 1848 benefited Louis Napoleon so much. When the election for Presidency was held, he filed a candidacy and won the election which made him the President of the Republic. The revolution of 1848 meant the end of the rule of King Louis Philippe.
D. Macro sociology is defined as: the sociological study of and long-term patterns and processes of large-scale social systems.