As was pointed out after the story of the Pathfinder was revealed, the "Major Race" definition is a social label used by the three Imperiums, and most persistently by the 1st, to keep other races in their place. The Vilani, Zhodani, Vargr, Hivers, and K'kree have never been in doubt. The Aslan turned a mysterious crash into a large interstellar state. Can't argue with that, even in the face of Vilani racism.
Similarly, Vilani detractors of the Solomani (many of whom are on the TML, but which have appeared in Canon as well) view the Solomani invention of Jump Drive with suspicion. When it is pointed out that the Solomani not only exceeded the Vilani Jump drive abilities, but also caused their millenia-old empire to fall, the Major/Minor argument becomes rather moot. The Solomani earned their Major status twice.