That reminded me of Mosiah 11:9. "And he [King Noah] also built him a spacious palace, and a throne in the midst thereof, all of which was of fine wood and was ornamented with gold and silver and with precious things."
This is the only palace described in the Book of Mormon, and it was made of wood. That's exactly what we would expect to find in a North American setting.
Verse 8 is also interesting. "And it came to pass that king Noah built many elegant and spacious buildings; and he ornamented them with fine work of wood, and of all manner of precious things, of gold, and of silver, and of iron, and of brass, and of ziff, and of copper."
From what I can find in the text, the only thing the Nephites built out of stone were "walls of stone to encircle" their armies, their cities, and their borders. (Alma 48:8).