Statistics for occurrence #1 of “Mr. Van Buren” in chapter 8 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.:

...Calhoun had become estranged and hostile not long after their joint election as President and Vice-President, in 1828. Mr. Calhoun's sanguine hopes of succeeding to the Presidency had been blasted. Mr. Van Buren supplanted him as Vice-President in 1832, sharing in Jackson's second and most decided triumph. And, though the Tariff of 1828 had been essentially modified during the preceding session of Congress...
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