How did the contributions of these "Captains of Industry" or "Robber Barons" affect the United States?

But the progress made in the United States during the Gilded Age can’t be denied. As part of the Second Industrial Revolution, the country underwent an impressive economic expansion — led by the day’s larger-than-life figures of wealth and power. Much of this growth was courtesy of railroads — which now spanned from coast to coast — as well as factories, steel, and the coal mining industry.

Explanation:

For the answer to the question above,  Martin Luther is using a metaphor to describe the struggle of segregation for himself and others. He accused the church leaders of not taking action, as they didn't experience the pain he is experiencing. He is trying to tell the church leaders that they have not experienced his hardships and struggles , so why are they making decisions to the things they didn't even experienced or understand?