The structure of Paragraph 4 in Roosevelt's First Inaugural Address help refine the ideas he uses (A) a topic sentence at the beginning of the paragraph that unifies the paragraph's ideas. With this he introduces the details for the main idea. But also (B) he uses sentences that alternate between abstract ideas and examples help make the paragraph's ideas convincing. It is a great resource to keep the viewer entertained. It is important to give depth by mixing the concrete with the abstract so that it is colorful and attractive to the listener / reader
Paragraph 4 is a descriptive paragraph since it establishes the characteristics of a particular situation and develops aspects that he wants to highlight. It contains three parts: the main sentence, the argumentative and the conclusive.