Read this chapter in the Book of Mormon
3 Nephi 9
The major cities of the Book of Mormon were burned and/or buried when Christ was crucified. Great judgements fell upon those living in the Americas at the time of Christ's death on the cross.. Christ then appeared to the survivors. There were great devastations/desolations..
This short video seems to give some evidence of a mass burial. Just stumbled upon it a while back..
Mysterious World - Peru
A quote from this short clip...
"The first traces of settlement go back 2500 years ago".
The Book of Mormon starts it's timeline 2600 years ago, when Lehi and his family left Jerusalem and set sail for the "promised land," the new world...
There is plenty of evidence if you really want to know if the Book of Mormon is true or not, most don't, and are only preoccupied with discrediting it, so they can make themselves feel better for rejecting it...
If you reject the Book of Mormon you are rejecting the fullness of Christ's gospel. Christ is the author of the Book of Mormon and the Bible. They are two witnesses of Christ as the Messiah that has come into the world to save us from the world.
John 3: 17
For God sent not his Son into the world to condemn the world; but that the world through him might be saved.