Statistics for occurrence #1 of “United States of America” in year 1861, month May, day 7 of Rebellion Record: a Diary of American Events, Diary from December 17, 1860 - April 30, 1864:

... United States of America
A serious riot occurred at Knoxville, Tenn., caused by hoisting a Union flag and the delivery of inflammatory speeches. ...
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† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.