1911 in 45acp, 7rds., was for Americans that could hit the target. Hi-Power was for Europeans that needed more rounds to hit the target. I have both, I prefer the 1911 with big bullets. If I carried a 9mm it would be the Hi-Power.The 1911 was designed for the .45 ACP caliber.
The Browning P-35 "Hi Power" was designed for the 9mm.
If one wants, why not have both???
The 1911 was specifically designed for the .45 ACP cartridge. The Army Ordnance Board specified the cartridge first and Browning designed a pistol for it. It was dimensioned to hold, feed, fire and eject that cartridge specifically. Chambering a 1911 in any other caliber compromises the efficiency of that design. While it certainly can and has been done, in most cases it will not be as reliable as it is with the .45 ACP. The High Power was specifically designed to function with the 9mm cartridge. I also believe that of the two, the High Power has better ergonomics for most hands which is impressive considering how good the ergonomics of the 1911 are. People have been attempting to "improve" on Browning's design genius for many years - and the result will always be a compromise.
There are so many little things that can affect reliability in a semi auto - the less you create by modfying the original design - the better.
I prefer originals, but mods do not seem to bother the AR or 10/22 crowd or disrupt the reliability of their units.
I can't get a made in USA Hi Power (do they even exist?). I can get a 1911 9mm made here pretty easily. That's a big advantage for the 1911 in my book.
HiPowers are made in Belgium, assembled in Portugal. Except for a few clones like FEG.
There are no US made HiPowers that I'm aware of.
Actually, I believe one of my Hi-Powers was made in the US. I have a low serial number Charles Daly HP. I bought it new in 2004. The research I have done, says the FEG HPs were directly copied from FN HP using original FN machinery that FEG bought from them and in turn Charles Daly bought from FEG. So they are about as close to a BHP as you can get without being a BHP. The quality of my pistol is very high, and for the price, I could not pass it up, and plan to keep it for a very long time.