Statistics for occurrence #1 of “Gen. Cass” in chapter 14 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.:

... first clear enunciation of the doctrine termed Popular (otherwise squatter) Sovereignty--that is, of the lack of legitimate power in the Federal Government to exclude Slavery from its territories. Gen. Cass 's position was thoroughly canvassed, six months after it was taken, in a letter from Martin Van Buren to N. J. Waterbury and other Free Soil Democrats of his State, wherein he said: The power, ...
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