Pit Bull Is Not a Breed

Historically, "pit bull" was an informal and slang label used to describe any dog that was subjected to the cruel sport of bull-baiting - using dogs (of any breed) to seize tethered animals such as

Are pit bulls recognized as one breed of dog? If not, how many breeds are included under the name 'pit bull'? - Quora

Should Pit Bulls Be Banned? Top 3 Pros and Cons

What's a pit bull? Animal Humane Society

Exploring Various Types Of Pitbulls: Beyond The Stereotypes

Get That Pit Bull Away from Me!: How Data Collection, Visual Identification, and the Media Created a Neighborhood Monster

Pit Bull Fact Sheet

Pitbulls: Separating fact from myth.

Breed-specific legislation - Wikipedia

The Problem With People, Not Pit Bulls : American Pit Bull Foundation