How Did I End Up With So Much .380 ACP?

I was organizing my ammunition this afternoon.  How did I end up with 1300 rounds of .380 ACP?  I have two pistols in that caliber.   I do not think anyone makes a carbine that caliber.

I have what I hope is a lifetime supply of .223,.308, 9mm, and a paltry 500 rounds of .45 ACP.

UPDATE: HiPoint makes a .380ACP carbine which depending on the reviewer is either cheap, almost recoilless and cheap, or a Jammatic.  I cannot justify $250 for a gun whose only YouTube video starts with a failure to feed, but if  HiPoint wants to send me one for review and testing,  I am game. .