Statistics for occurrence #1 of “President Buchanan” in chapter 26 of Horace Greeley, The American Conflict: A History of the Great Rebellion in the United States of America, 1860-65: its Causes, Incidents, and Results: Intended to exhibit especially its moral and political phases with the drift and progress of American opinion respecting human slavery from 1776 to the close of the War for the Union. Volume I.:

... The President mildly accepted his resignation, and appointed Joseph Holt, of Kentucky, to succeed him. By the middle of December, Hon. Caleb Cushing, of Mass., was dispatched to Charleston by President Buchanan as a Commissioner or confidential agent of the Executive. His errand was a secret one. But, so far as its object was allowed to transpire, he was understood to be the bearer of a proffer from Mr....
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