How is stride piano relative to ragtime and jazz?

Stride and Noveltty piano were developed from the Ragtime. That was about1920. Stride piano came up in Harlem, NY where black pianists, which hadnt a musical graduation, began to improvise the Rags and so created an own style. Novelty piano developed about the same time in Chicago where only white pianist, which had a highly musical graduation and which were influenced by the european music-styles began to create their own style. Stride and Novelty piano sound very similar so they can be called the first Jazz-styles.