People should read the fine print.
Lost Tribes of the Book of Mormon: A Correlation Between the Nephite Nation and the Mound Builders of the Eastern United States
This Land: Zarahemla and the Nephite Nation
In Search of Cumorah
The book of Mormon presupposes democratic forms of trade; Hopewellian trade, like most trade before the American Revolution, was solidly in the hand of the dominant elites. The Mormon text inverts the relationship between wealth and trade. You do not become wealthy by trading, you get to trade because you are influential and wealthy.
Plus, the standard explanation for the demise of the mound builders is exhausting their habitat through inappropriate patterns of exploitation. Nothing there about warfare.