American Mustangs are wild horses that roam the western regions of the United States.

Origins:
North America wasn't always a land of horses. On the contrary; when the Bering land bridge that connected the continent of North America with Asia disappeared underwater, and the continent as we know it today was formed, there were no horses on it. Horses were first introduced to North America in the 1500s, when Spanish conquerors arrived at the western shores of America with their Spanish horses.

The Spaniards settled in North America and built ranches in which they kept their cattle, sheep, and horses. Some of those Spanish horses escaped from the ranches by taking advantage of broken fences during Indian raids or by breaking down the fences themselves, and became wild horses.

Development:
The wild Spanish horses met wild draft horses, ponies, and non-Spanish horses, who escaped from the ranches in the eastern regions of North America. The American Mustang is the result of this mix of breeds. Living in the wild plains of North America, with minimal to no human intervention, these horses became smaller and stronger. They gained the name "Mustang", which is derived from the Spanish word "mesteno" which means stray.

By the 1800s there were millions of American Mustangs roaming the plains. A clash between those massive herds and local farmers, who needed more grazing spaces for the cattle, was only a matter of time. Farmers started to hunt the Mustangs, and by the 1970s there were only around 30,000 Mustangs left.

In order to prevent the complete extinction of those wild horses, a new law was passed in 1971 that prohibits hurting or hunting Mustang Horses on federal land. It was later amended to allow the management of the Mustang population by the American Government.

The American Mustang Today:
Today, wild herds of Mustang horses can only be found in nature reserves and national parks in the USA. Excessive horses are eligible to be adopted by individuals, which is why American Mustangs can also be found in private ranches. They are popular as endurance horses.

Performance metrics:
The following are the: range, average, (SD), and MOE of performance metrics of ordered American Mustangs in Horse Isle (not bred ones). In rare cases, horses might have metrics outside of the range. Breeders can produce horses that are beyond this range.

Speed: 13.8-15.5, 14.7 (0.3), 0.07.
Sprint: 54-66, 59 (3), 0.53.

Accel: 1.03-1.18, 1.10 (0.04), 0.01.
Decel: 0.93-1.10, 1.02 (0.04), 0.01.

Jump: 4.89-5.20, 5.05 (0.06), 0.01.
Pull: 2.14-3.09, 2.57 (0.21), 0.04.

Turning: 56.39-68.87, 62.71 (3), 0.59.
Reverse: 2.5-3.2, 2.9 (0.1), 0.03.

Stamina: 46.05-52.13, 48.83 (1.43), 0.28.
Reaction: 0.72-0.83, 0.78 (0.02), 0.00

Coats & Height:

Colors & patterns: all colors and patterns except for manchado and mushroom.
Height: usually 13hh to 15hh, but full range is 13hh to 16hh.