Bro,
You are entitled to think I may be wrong, in the same way I am entitled to think you are equally wrong and relying simply on sweeping generalizations on the subject. Likewise, I am also a jazz enthusiast and also a professional musician...so I don't think you have a monopoly on the facts and the truth concerning the topic.
I equally respectfully submit that you appear to be unable to read between the lines of the sources I quoted and it seems you are likewise prone to making sweeping conclusions on the articles you have read (and are quoting).
Collectively speaking, modern music experts now recognize that jazz per se originated much earlier than the beginning of the 20th century.
By 1808 the Atlantic slave trade had brought almost half a million Africans to the United States. The slaves largely came from West Africa and brought strong tribal musical traditions with them. Lavish festivals featuring African dances to drums were organized on Sundays at Place Congo, or Congo Square, in New Orleans until 1843, as were similar gatherings in New England and New York. African music was largely functional, for work or ritual, and included work songs and field hollers. The African tradition made use of a single-line melody and call-and-response pattern, but without the European concept of harmony. Rhythms reflected African speech patterns, and the African use of pentatonic scales led to blue notes in blues and jazz.
Now again...try and read between the lines muna -- the use of pentatonic scales led to blue notes in blues and jazz. This statement does not state that blues existed before jazz. Neither does it say that the blues influenced jazz. It merely states both the blues and jazz benefited from the usage of pentatonic scales.
To also paraphrase your statement above "Because fact of the matter is, the term jazz wasn't even in usage until the time between 1910-1920" --- The word began as West Coast slang around 1912, the meaning of which varied but did not refer to music or sex. It came to refer to the music in Chicago around 1915. The music was played in New Orleans prior to that time but was not referred to by that name. The word jazz makes one of its earliest appearances in San Francisco baseball writing in 1913. Jazz was introduced to San Francisco in 1913 by William (Spike) Slattery, sports editor of the Call, and propagated by a band-leader named Art Hickman. It reached Chicago by 1915 but was not heard of in New York until a year later. One of the first known uses of the word appears in a March 3, 1913, baseball article in the San Francisco Bulletin by E. T. "Scoop" Gleeson.
So, ayun ewan ko lang how reliable yung source that you're quoting. Also now, just because a term was not yet used at the time, it does not mean that the music or that specific form of music didn't exist yet.
Mas safe to pa siguro na jazz was influenced by classical music (rather than the blues) kase jazz in its primitive forms originated from ragtime music. The abolition of slavery led to new opportunities for the education of freed African-Americans. Although strict segregation limited employment opportunities for most blacks, many were able to find work in entertainment. Black musicians were able to provide "low-class" entertainment in dances, minstrel shows, and in vaudeville, by which many marching bands formed. Black pianists played in bars, clubs, and brothels, as ragtime developed. Ragtime appeared as sheet music, popularized by African American musicians such as the entertainer Ernest Hogan, whose hit songs appeared in 1895; two years later Vess Ossman recorded a medley of these songs as a banjo solo "Rag Time Medley". Also in 1897, the white composer William H. Krell published his "Mississippi Rag" as the first written piano instrumental ragtime piece, and Tom Turpin published his Harlem Rag, that was the first rag published by an African-American. The classically trained pianist Scott Joplin produced his "Original Rags" in the following year, then in 1899 had an international hit with "Maple Leaf Rag".
With regards to blues, during the first decades of the 20th century, blues music was not clearly defined in terms of a chord progression. With the popularity of early performers, such as Bessie Smith, use of the twelve-bar blues spread across the music industry during the 1920s and 30s. Other chord progressions, such as 8-bar forms, are still considered blues; examples include "How Long Blues", "Trouble in Mind", and Big Bill Broonzy's "Key to the Highway". There are also 16-bar blues, as in Ray Charles's instrumental "Sweet 16 Bars" and in Herbie Hancock's "Watermelon Man". Idiosyncratic numbers of bars are also encountered occasionally, as with the 9-bar progression in "Sitting on Top of the World" by Howlin Wolf.
O let's read between the lines, shall we?
Jazz = recognizable form was theoretically in existence na prior to 1912, originated from ragtime music since 1895 pa
vs
Blues = recognizable form theoretically existed during 1920s and 1930s; originated at the end of the 19th century (i.e. 1900 pr 1901)
I think it's pretty clear already which musical style predates the other.
Bro, it's not enough to be an enthusiast and it's not enough to be a musician sa jazz. I suggest you broaden your horizons further and read more on the subject, before you label other people's statements as being wrong or baseless.