Is there no local loop wholesale in the USA?
No, not in the USA. Unique for a western ISP market AFAIK.
The cable companies don't have to share their network, and I don't think their network is structured in a way that would make local loop even possible. I don't believe they have a dedicated local loop per customer.
Fiber installations by the telecoms don't either because they are in a competitive market. Also, only Verizon has laid out FTTH.