the QWERTY keyboard, 

because that’s the order of the letters on the first row of keys

 The first machine was invented by Christopher Sholes, in 1873, to improve on calligraphy, but there was a problem:

 If a person typed very fast, the keys got stuck together and stopped the machine from working. 

Then Sholes designed the QWERTY keyboard, a keyboard that would oblige typists to type more slowly. 

 Remington—which made sewing machines as well as guns at the time—used the QWERTY keyboard for its first typewriters. 

That meant that more people were forced to learn that particular system, and more companies started to make those keyboards, until it became the only available model. 

 The keyboard on typewriters and computers was designed so that people would type more slowly, not more quickly