Blue jeans have been a symbol of American fashion since their creation. While a lot of the mass manufacturing has moved over seas and many niche brands are known to come from Japan, there is still a sector of the industry manufacturing jeans in the USA.
Check out this video on Youtube from Levi-Straus, the company credited with the invention and rise of the American Jean. This video takes you through the history of the 501 Jean starting with the manufacturing of denim at the Cone Mills fabric mill:
Some notable Jean brands currently made in the USA: