HELP PLEASE Explain why the railroad and steel industries were interdependent during the 19th century?

Explain one way that expansion of the railroad and steel industries helped other industries to grow during the 19th century?

Explain two ways that expansion of the railroad and steel industries impacted the organization of big business in the United States during the 19th century?

Idon't really understand the question. it counts for 20% of my lesson grade and i really need putting the answer into words. anything will . i need asap so im awarding 30 points. a disagreement between states of the united states concerning the rights of states vs. the authority of the national government led to the civil war. state governments were forced by war into a subservient position. what might happen if national governments ceded their authority to a world government by international treaty?

What was the significance of john hancock's signature on the declaration of independence?

Brown party's views on industry and agriculture