God promised through Jeremiah that what would be destroyed after the 70-year captivity had ended?

Jeremiah's famous 70-year prophecy An important inscription from the reign of Esarhaddon suggests that they be viewed as inter-related rhetorical devices. The Esarhaddon inscription, written in relation to that king's extensive building program in Babylon, contains both a 70-year decree and the Akkadian Cuneiform parallel to the Hebrew Alphabetic atbash codes

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the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain