I never went through the whole list because it took a super long time, but when I tried sampling where most of these ~300 drugs were developed, it was like 80% developed in the US. I got through like 50-60 of them before I gave up. 50-60 should be good enough to be representative of the 300 or so. Feel free to go through them yourself if you don't believe me.
I didn't so I did.
I checked the first thirty listed in the Wikipedia article. Of those, only 8 have been developed in the USA including one developed by the American branch of a Swiss company.
That's merely 26%. Not insignificant but quite far from 80%. After a quick sampling of the rest I would be surprised if the exact proportion is above a third.
Halothane - England (1956)
Isoflurane - United States (1979)
Nitrous Oxide - England (1772)
Oxygen - N/A
Ketamine - United States (1966)
Propofol - United States (1989)
Bupivacaine - Sweden (1957)
Lidocaine - Sweden (1885)
Ephedrine - China (?, introduced to western medicine by an American traveling to China)
Atropine - Germany (1833)
Midazolam - United States (1976)
Morphine - Germany (1803)
Aspirin - France (1853)
Ibuprofen England (1953)
Paracetamol - United States (1877)
Codeine - France (1832)
Fentanyl - United States (1960)
Methadone - Germany (1937)
Amitriptyline - United States (1960)
Cyclizine - United States (1947)
Dexamethasone - United States (1957)
Diazepam - United States (1959)
Docusate - ???
Fluoxetine - United States (1972)
It's ridiculous how hard it is to figure out where most of these were developed.
When I first went through the WHO list, I did so in reverse by year of discovery:
https://en.wikipedia.org/wiki/List_of_drugs_by_year_of_disco...
I stopped checking again at this point. As a reminder your first claim was 80% of the list. I think your reliability has clearly been established at this point.
https://en.wikipedia.org/wiki/List_of_drugs_by_year_of_disco...
Except for Alectinib, which was developed in Japan, 13 of the 14 drugs developed in the 21st century for example have been developed in the United States:
That's 93%. Again what has the rest of the World been doing?
So 9 by the 24th in the list not 30, so your reliability has also been established.
Citation needed.