>I want a clarification about a text that appears in my son's Social Civics (U.S.) textbook.
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>"Senator Edmund Ross cast the deciding vote for acquittal in the Senate trial of President Andrew Johnson and thereby helped to preserve the historic powers of the Presidency."
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>The question is, does anybody understand why his vote would, in any way, be more significant than that of the other 18 senators that voted for acquittal?

Good point. I think all it means is his vote was the one that assured acquittal.