Greensboro, NC's Cone Mills is the go-to source if you want American-made denim, and the mill's heritage looms large amongst denim bros and lovers of all things vintage. But it wasn't until Levi's had made jeans for 42 years that it called upon the now-purveyor of indigo greatness to produce jeans out of its fabric. This switch resulted from Amoskeag falling upon hard times, and would subsequently collapse as an operating mill. Come 1922, Levi's only received denim from Cone.