Statistics for occurrence #1 of “United States of America” in chapter 35, page 577 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.:

...their authority, and on their behalf, and subject at all times to their free and unbiased control, make and publish this provisional declaration, that, by the acts of the people and Government of the United States of America , the political connection heretofore existing between said States and the people and Government of Missouri is and ought to be totally dissolved; and that the State of Missouri, as a sovereign, free,...
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