The ACP was developed to pop muzzies in the Philippines in 1911 AD.
Yes, I do know that. The .38 that was in use at the time was not stopping the Moros. The .45 Long Colt in Single Action Army revolvers was getting the job done. So Browning developed the .45 ACP for his 1911 semi-auto.
I refer to it as “American Commie Popper” because of the abbreviation “ACP” (Automatic Colt Pistol) and it was used in Korea and Vietnam - where we were WERE “popping Commies”.