It's not entirely the US. Unfortunately there's other people in the region who really don't want anyone being friends with Iran who we'd rather be friends with.
Back when it looked like relations might thaw during Obama every big business was foaming at the mouth over the opportunity to make a buck selling things in a new market. There's a lot of very powerful people who's ideal vision of places like Iran, Cuba, North Korea, etc involves everyday citizens using their iPhones to daytrade on the American stock exchanges over a Verizon tower while driving their Chevrolet trucks, smoking Marlboros and wearing Nikes
Back when it looked like relations might thaw during Obama every big business was foaming at the mouth over the opportunity to make a buck selling things in a new market. There's a lot of very powerful people who's ideal vision of places like Iran, Cuba, North Korea, etc involves everyday citizens using their iPhones to daytrade on the American stock exchanges over a Verizon tower while driving their Chevrolet trucks, smoking Marlboros and wearing Nikes