The central idea of the text is about an ongoing revolution about which the speaker is addressing the congress. Note the following textual evidence:
"The present revolution is but the successor of other similar insurrections which have occurred in Cuba against the dominion of Spain, extending over a period of nearly half a century, each of which, during its progress, has subjected the United States to great effort and expense in enforcing its neutrality"
The speaker should have make their speech clearer by stating the intentions of their speech early in the presentation.
The central idea of a text is the key thought around which other elements int he text or literature revolve.
A central idea can be easily identified by looking at the thoughts expressed in a text starting from the introduction.
The central idea also contains or portrays the purpose or reason for which the author has penned down the text.
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