It should be noted that the central idea simply means the central, unifying element that's in a story.
Your question isn't complete as you didn't provide the speech. Therefore, an overview of a central idea will be given. The central idea is the generic truth or the main idea on the story.
In order to get the central idea, you need to understand the speech very well. Then, you've to note what the speech is about. This implies the message that the president wants to convey to the audience.
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C. Dickinson uses rhyme but whitman dos not ( APEX)
