So we seem to have not quite answered the OP's underlying question, from the thread title:
Recent amps made in Maryland include:
DG, J-MOD, Archon, and HXDA. HXDA recently discontinued.
Other older amp models made in Maryland include Blistertone, MDT, Dallas varieties, Sweet 16 (or 16+), Paul's Amp, "30", Texaplex, Blue Sierra, "Recording amp", a line called "2 Channel", and a variety of "Custom" amps. Probably other models I've missed.
However, there is a line of (Chinese-made, IIRC) SE "2 Channel" amps that look similar, at fist glance, to the US-made ones.
Sonzera is non-US made.
MT is non-US made.