Based on the ideas of the text, it can be inferred the main idea is "Collective responsibility is essential for the good of mankind."
This is the central idea or main point an author develops in a text. Usually this idea is supported by all the details in a text and might be explictily mentioned at the beginning of the text.
In this text, the author John F. Kennedy focuses on persuading the audience to be responsable and proactive citizens as he describes people should ask themselves about what they can do for their country.
Based on the details provided such as "what you can do for your country" the main idea of this text is that collective responsability is essential for the country.
Learn more about John F. Kennedy in: https://brainly.com/question/13721861
#SPJ1