>>64165319
>Why is it the most popular choice worldwide again?
Because the krauts left stockpiles of it all over Belgium and France, which made NATO standardize it out of convenience. The entire global firearms industry and law enforcement+civilian markets operate downstream from military procurement, so 9mm became the most popular choice. If the USA had bullied NATO into standardizing 45 ACP like we did for 308 and later 5.56, then 9mm would be about as relevant as 380 is today.