Answer :
In this passage, Harburg is trying to say that his music is giving voice to the working class and soldiers who fought in the wars.
What is being conveyed from passage?
Harburg is pointing to the working class when he says, "I built the railroads. I built this tower,". He is trying to show that the working class is important and deserve a voice in their favor. When Harburg speaks of "I fought your wars", he is referring to the soldiers who fought wars and took the victory for the country.
In the last sentence of the passage, Harburg reinforces the idea that workers and soldiers have built the wealth of the nation and should not be treated with anything less than what they deserve.
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