The vast majority of nicotine solution comes from China.
PG and VG may or may not come from there.
A "USA made" juice is mixed in the US from one or more China sourced ingredients.
Since nearly all the nicotine comes from China, I don't consider it misleading to state that a mixture made in the US is USA made. There is almost nothing made in the U.S. without at least one component sourced from another country.
I make my own
juice. I use nicotine that almost certainly is originally supplied to my vendor's vendor at 99.8% concentration from China.
I don't sell it, but if I did, I'd call it USA made because that's where it is made.
Most people couldn't afford juice with nicotine source from the US or Europe.
There is such a thing and it's horrendously expensive.
If you saw the Chinese juice factories, like Dekang for example, you wouldn't characterize them as "slave camps".
I wouldn't hesitate to eat off the floor of a Dekang factory.
That's more than I can say about a lot of the kitchen counter juice labs in the U.S.
The biggest scandals in the nicotine and juice business in the last 2 years both involved US companies.
When Chinese companies screw up badly, they get thrown in jail. The melanine pet food incident is a case in point.
When an American company, like Box Elder, sends out 200mg nicotine labeled as 60mg nicotine, he has a recall and life goes on.
Your passion could be better spent elsewhere. Maybe start with American clothing manufacturers that run slave labor camps in the U.S. territory of the Marianas Islands and stick "Made in the USA" tags on them.