Macy’s is rolling out Americana in a new marketing campaign throughout 850 stores that encircles Independence Day. Classic fashion staples of denim, T-shirts and sneakers are the inspiration for “American Icons,” the new campaign that will run through the week of July 4. The effort includes in-store displays, magazine ads, direct-mail catalogs and a charity fundraiser. “It’s about driving sales,” says Martine Reardon, Macy’s chief marketing officer.