What is the #1 most aggressive dog?

I'm curious, what breed of dog is considered to be the most aggressive out there? Is there a specific breed that stands out as the number one most aggressive dog, or is it more of a case-by-case basis depending on individual dogs and their upbringing? I'm interested in understanding the factors that contribute to a dog's aggressiveness and whether there are any breeds that are inherently more prone to displaying aggressive behavior.