As with any breed of horse, you have to have a market for that breed. Most industrial nations have the resources to afford the luxury of non-working horses.
Like in full-size horses, miniatures' teats are mostly retracted when not pregnant.
Horses mostly came to the U.S. from Europe
no census is done on horses - breeds or sizes. So that is impossible to answer. Mini's are mostly pets and being small they are easy keepers so affording them is not an issue.
The Przwalskis horses live in europe and asia mostly found in plains or a larg amount of flat land
Carro, coche, automóvil, auto. It depends on locality. Coche is mostly used in Europe, carro, auto, automóvil mostly in the Americas.
Horses were brought over by the Europeans to the Americas. The Europeans brought over their horses, which some had been trained to race (mostly Arabians). They created the breed that we call today, the Thoroughbred, by mixing Arabians with other pure breeds.
horses are mostly found in grasslands
Roughly 2/3 of all cases of anorexia occur in "Western" Society. That is, the Americas and Western Europe, mostly.
Most equine stores, mostly specialty stores, should have things like that. If you can't find them there, there are special websites that sell things just for minis.
Probably mostly because horses today are used mostly for riding, not for breeding.
Horses are mostly used for work or for competitions.
Horses mostly sleep standing up. Horses do lie down occasionally, but most of the time they feel too vulnerable to do so. You will be more likely to see a horse lying down to sleep in a stable than out in a field. Horses live anywhere from stables to pastures, to islands. Also, some miniature horses have also been known to live inside their owners' home when used as therapy horses.