I've heard that in some cities in the US like LA and Florida, the 'aw' sound is pronounced as 'ah' such as slaughter, daughter, dog, water. They mostly are pronounced with the 'ah' sound rather than the 'aw' sound.
So is this a major rule thing; Does the 'aw' truly not exist in some places and is pronounced as 'ah'?
If so, that means 'tall' can be pronounced as 'tall' right?
Here's a link that has the word pronounced by many US speakers: https://forvo.com/word/tall/#en