purchasing US made speakers

+1 on Salk. In your price range you could do the new SS9.5 with the midrange that can be open or closed. I own the Song3 BeAT with the same tweeter and midrange driver.  Midrange is outstanding.  

It's the size and shape of your room (and the placement in the room) that matters most. Don't buy a speaker you have not auditioned in your room. Try as many as you can before purchasing. I've had modestly priced speakers that outperformed much expensive ones because of room interactions or inability to place the speakers where they can sound their best (WAF and other practical considerations) If you have to change your amp to suit the speaker, so be it. 

I have a pair of the Fleetwood Deville speakers and they sound incredible, USA made a horn based speaker and even come with a lifetime guarantee
Oswaldsmill owns them and they came up with a lower price point so it's in an affordable price range  

I bought a speaker not auditioned in my own room. Not auditioned by me in any room. Its the best speaker I ever heard in my life! Its everything I had come to expect from reading reviews, impressions, and design theory. Only better. The old advice to always home audition first is a good one only if you won't use the search bar and instead are willing to severely limit your options.

The US made speakers with the best tech and value are made in Utah by Eric Alexander at Tekton Design. End of story.

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.