Answer:
I'll assume you mean Lincoln's famous Gettysburg Address. From that address, here are some examples of organizing ideas in groups of three: The main example is the overall 3-part outline of ideas in the speech. Idea 1 (paragraph 1): This nation was based on the idea that all men are created equal.
Explanation:
1. Assimilation
5. Chinese Exclusion Act
7. Election of 1912
Those are the only ones I know. Good luck!