The correct answer is D. Americans have strong morals
Explanation:
A theme is an idea, message or belief about some aspect of life such as love, education, death or war. This idea is not usually stated by the author, but suggested and supported by the author's words during a speech or text, which means the reader will need to interpret the text and look for specific details to understand the theme of a speech or text. Additionally, there are common themes or ideas that are used universally or that are related to some specific context or culture.
In the excerpt from Fraklin D. Roosevelt he suggests during the American history, the citizens of the U.S. have supported a peaceful revolution without entering to a direct war and because of this Roosevelt supports the idea of cooperation with other countries in a civilized society. This means Roosevelt believes the war is not the best way to achieve goals or changes, and instead cooperation and keeping peace should be the principles, which also means the moral of Americans stop them from using the war or direct conflict as the way to get something. Thus, in this speech from Roosevelt, the common American theme is that D. Americans have strong morals, which is the reason Roosevelt uses to argue that during history the U.S. has only participated in peaceful revolutions.