The Lakota can build Walls from the Industrial Age.
Early fortifications in the New World were palisades constructed of sharpened tree trunks driven into the ground side by side to form walls. Some of these palisade walls, especially when a little green, were remarkably effective at withstanding bombardment by artillery because they could flex as they were hit, rather than splintering, like dried wood, or shattering, like masonry walls.
More effective than either wood or stone at withstanding bombardment were the bermed earthworks famously ringing star forts like Fort McHenry. A fort in the era of cannon was a series of sculpted plains, ditches, bastions, and walls of earth and stone that maximized lines of sight and fire for defenders.