Here's why:
* MLA and APA Style: Both of these common academic writing styles recommend using quotation marks for titles of speeches, as they are considered short works.
* Clarity and Consistency: Underlining is often used for titles of books and longer works. Using quotation marks for speeches helps distinguish them from longer works and creates a consistent style throughout your writing.
Example:
Instead of: _"I Have a Dream"_
Use: "I Have a Dream"