Jazz is not a closed historical style the way most sibling movements in this section are; Wikipedia's own treatment states plainly that "Other styles and genres abound in the 21st century, such as Latin and Afro-Cuban jazz," describing continuing development rather than a closing event. No scholarly source consulted names a year or event at which Jazz as a genre ended, because none has happened.
What would resolve this A conductor or taxonomy decision on whether a living, still-practiced genre like Jazz should carry an end-year core key at all, or whether the key should be understood as not-applicable for genres with no closing event, distinct from a movement whose end is merely debated among several candidate years.
OpenMusic History / TaxonomyJazz (Wikipedia)