How did the expansion of the railroad industry lead the rapid industrialization of the united states?

The expansion of the railroad industry lead to rapid industrialization by allowing the transport of goods;product; and travel more accessible to the people. With transport being expanded, people and business could spread their business' and labor to more places. 
ex:
If you have a small town with one starbucks and the town starts to grow and grow, you're going to build another starbucks on the other side of town, and so on and so forth. 

It developed as a reaction to the impact of european colonialism in africa on peoples of african descent. in the  mid-20th century, activists in africa adopted pan-africanism as a rallying cry for independence from colonial rule. some african pan-africanists sought to unite the continent as one independenthope it was useful