Mikrotik manufactures a lot of stuff in Latvia, yes. That's where they're based, and where most of their engineering happens.
Some of their stuff is also stated to be made in, at least, Lithuania, Malaysia, Vietnam, and China (in no particular order).
And I really don't have much of an idea how much of the devices are made in any of those places, but it's not hard to find an occasional clue.
For example: The Mikrotik wAP AC that is hanging on the wall in the room where I write this is was labelled as having been made in Latvia when I bought it. But the main brainbox IC inside of it, a Qualcomm QCA9556, is manufactured by TSMC. That's probably not something made in a Latvian plant.
What of the rest? The metal and plastic components of the housing? The connectors, the PCBs? The jelly-bean parts on those PCBs?
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The recent ham-fisted FCC rules make it so any foreign-made component of a new router design excludes it from sale in the US, by default.
It may be harder than you think it is to get this done.
Even the simple stuff might be hard: Do we even make LEDs in the States? I don't mean anything high-power or fancy (we definitely don't make those here), but I also can't find any evidence suggesting that we can even manufacture a lowly status LED in the US at this point.
Or, something mechanical: PCB-mount 8P8C ethernet jacks. I don't find any of those manufactured in the States, either. (Can we even muster up the effort to make those? They're mostly injection-molded plastic, which we haven't forgotten how to do stuff with. But they also use beryllium copper, which is a special kind of a spooky to work with in terms of health hazards.)
I'm not sure that Mikrotik putting together some stuff in Latvia, of all places, represents a very good example: If they were doing in Nebraska what they presently do in Latvia then their products would still be excluded by default.
