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Those Ancient Jaredite Inhabitants Who Were Destroyed

 "...I, Moroni, proceed to give an account of those ancient inhabitants who were destroyed..." (Ether 1:1)
"...the whole face of the land was covered with the bodies of the dead."  

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What I find very interesting is that the Jaredite nation did not fight against another nation or group of people.  As recorded in the Book of Mormon, they destroyed themselves.
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Diego Durán (c. 1537–1588 AD) 
The Catholic friar, Diego Durán, recorded as follows;
"The Giants tried to defend themselves...but finally all were killed.  Once the giants were annihilated, the others built their towns and cities as they wished, without any opposition or difficulties."

 <<  (The History of the Indies of New Spain, p.18)
 
 


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"No one knows what Happened to their Civilization.  This much is sure: after the decline of the major city at La Venta, around 400 BC, the Olmec civilization was pretty much gone."  (About.com, Latin American History)

 
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 << Smithsonian, Olmec Legacy Tres Zapotes, Veracruz,  Matthew Stirling kneeling by Tres Zapotes Monument G. The features of this monument are so badly damaged that the face cannot be reconstructed. 
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“Michael Coe’s San Lorenzo excavations, which began in 1966, produced further data on the act of mutilation, and partially laid to rest the concept that mutilation was carried out by outsiders.  Coe. 1967c:25) states: “Toward the end of the San Lorenzo phase (1150-900 BC), all of the great basalt monuments of San Lorenzo had been mutilated and then laid out in long lines on ridges around the peripheries of the site…I take this to have been a revolutionary act for we have no evidence that it was any other than San Lorenzo people themselves who carried out that great act of destruction.”  This statement shows that not only did the San Lorenzo Olmec create their monuments, they destroyed them as well”  (Michael D. Coe, The Olmec & Their Neighbors: Essays in Memory of Matthew W. Stirling, P.55)
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"Around 400 BC La Venta went into decline and was eventually abandoned altogether. With the fall of La Venta came the end of classic Olmec culture."  (The Decline of the Olmec Civilization, The Fall of the First Mesoamerican Culture,  About.com, Latin American History)