purchasing US made speakers

Joseph Audio, Devore Fidelity, Bache, Silverline, Ryan Speakers, Fritz Speakers, Spatial Audio, and Eggleston Works would be at the top of my audition list for American brands. 

At lower price points there is Zu Audio, Omega, Ascend Acoustics, Magnepan, Tekton and Salk Sound. Salk seems to offer a near endless number of custom options and price points.

Omega might fit your needs since they use full-range drivers that eliminate the need for a crossover in the midrange. The strength of full-range drivers is a midrange purity that comes at the expense of top octave "air" and shimmer. Omega and Salk produce some of the best veneer work in the biz if that matters to you. 

Fritz puts the same level of drivers into his $3K speakers that are not uncommon in $20K speakers. 

In the pre-owned arena, I'd look for a gently used pair of Rockports. The ones I've auditioned came the closest to what I'd consider a flawless sound. 

Daedalus, Fritz, Salk, and Odyssey are all American made speakers with superior models in the original poster’s price range. They are all exceptionally well-made and backed up by great customer service.

+1 on Salk, especially anything with the RAAL ribbon tweeters

I too have a high frequency hearing loss.  After struggling with tuning my system for years I finally went to an audiologist and got fitted with hearing aids.  After having done this I am now enjoying music much more.
As for speakers I would recommend zu audio in Ogden Utah.

Volti, Klipsch, Zu Audio, Spatial Audio