About July 19, 1840
Nauvoo, Illinois
While giving a discourse, Joseph Smith prophesied that the "time would come when the nations of the whole earth, even this nation the United States, will be on the very verge of crumbling to pieces," and the United States Constitution would hang by a thread.
Sources:
The Words of Joseph Smith: The Contemporary Accounts of the Nauvoo Discourses of the Prophet Joseph, Andrew F. Ehat, Lyndon W. Cook, pp. 415–16
"Joseph Smith's 19 July 1840 Discourse," Dean C. Jessee, BYU Studies 19:3
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