Ragtime, originated out of America during the late 1800s and the early 1900s.
Ragtime was the first truly American specific musical genre, it even predated Jazz.
Ragtime began as dance music within the red-light districts of some American cities, such as St. Louis and New Orleans, this was many years before it was published as popular sheet.
It was a modification of the march made popular by John Philip Sousa, with additional polyrhythms coming from African music.
The ragtime composer Scott Joplin probably became the most famous, somewhat due to the publication in 1899 of the “Maple Leaf Rag” and a string of ragtime hits that followed, sadly he wasn't remembered as well as he deserved to be, other than by a small, dedicated community of ragtime fans, but thankfully there was a resurgence in his popularity during the early 1970s.