Tents made in the USA are pretty rare nowadays. 20-30 years ago a lot of tents were stitched up in Berkeley, but not anymore.

The Hilleberg's are made in Sweden. For other non-developing world manufactured tents,

Integral Designs are made in Canada. Stephenson's Warmlite tents and sleeping bags are made here in the US. An ultralight tent called the PuppyPile (designed for endurance race teams) is stitched here as well.

Bibler MIGHT make some tents in Utah, but since their buyout by Black Diamond, I think most of their line has been offshored to China.