If you can't remember the first deer you killed you might want to think of getting a new hobby.
I don't get the question though? Why does the geographical location have anything to do with it?
Mine was a 150 lb (dressed) 7 point shot in lower Michigan. Opening day of bow season at 5:30 in the afternoon. It was the first time I had ever hunted and I was only in the stand for about half an hour. Shot it with my Darton Yukon set at 60 lbs and 26 inches of draw with a Nitro Stinger arrow.
There were actually two deer under me, a 7 point and a ten point. I wanted the 10 point but it just wouldn't give me good shot ( so I thought, looking back I could have taken him). Then the 7 point turned perfectly broad side and stuck it's head in the weeds to browse on something. How could I pass that up on my first day of hunting!
I was going to say I remember the first deer I killed with a gun as well the following year (inline muzzle loader), but I remember every deer I have killed pretty vividly. I have only been deer hunting since 2000 though, so it's not like I have to remember back 30 years or anything

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Paul