Steel i-beams form a perimeter barrier at Nucor Steel Berkeley in Huger, South Carolina, on Thursday, May 1, 2025, when Vice President J.D. Vance spoke there. (File photo by Mark Susko/Special to the SC Daily Gazette)More than a month after the latest tariffs on Canadian-made products were enacted, the trade war’s impact on South Carolina’s economy is still difficult to assess, even as further restrictions on Canadian imports take effect Tuesday…