The reason you don't see those types of instruments in the USA is that they are particular to a British style brass band. They have been around GB since 1850.
There are about 150 or more British style brass bands in the USA. I play in one here in Winona, MN.
Check out
www.NABBA.org. (North American Brass BAnd Association) You can find out all about British stlyle brass bands here in the USA.
The full instrumentation is 1 Eb Soprano Cornet, 4 Bb Solo Cornets, 1 Bb Repieno Cornet (just used as a reenforecment), 2 2nd Cornets, 2 3rd Cornets, 1 Bb flugel, 3 Eb Tenor horns, 2 Bb British style baritone horns, 2 Tenor trombones, 1 Bass trombone, 2 Euphoniums, 2 Eb Tubas, 2 BBb Tubas and percussion.
There are thousands of arrangements and original pieces written for that instrumentation. The sound is unique. Up to 13 individual parts are being played at one time.
Great fun.