Mithras - Men will be banned from all forms of public office, business, land-holdings, and rights, and forced to live in "Breeding Camps" : small, enclosed, self sufficient compounds, hidden from the public eye, that serve only one, obvious purpose... Which, by your point of view, may be the greatest thing ever!
Elvaan - The Elvaan would still be the elitist, spiteful, condescending jerks they always are. They'll still talk lowly of the other races, even in front of Sand'Orian citizens that happen to be TaruTaru and Galkan, except now they'll look at you and say "Oh, but you're one of the good ones *Smirk*" . Then, as the insulted character walks away fuming, the Elvaan will snicker amongst themselves. That, and you'd all be forced to drink out of elaborate tiny-teacups (pinkies out!) and eat scones every day. (Now THAT'S fancy!). Finally, there would be a sudden influx of Mithran servants among the nobles...
Humes - BURN FOSSIL FUELS! STARBUCKS ON EVERY CORNER! ENSLAVE THE NATIVE PEOPLES! HUNT TO EXTINCTION THAT WHICH OPPOSES OUR PROGRESS! KILL ANYONE WHO GETS IN OUR WAY! THE GOVERNMENT WILL TURN A BLIND EYE TO ALL! IT WILL BE A TRAVESTY, A SHAM, AND A MOCKERY! A TRAVESHAMOCKERY! LOL ROFFLEZORZ!!!!111
TaruTaru - All the furniture makers in the world would have to conform to SHORTIES - Severe Height-challenged (Or Really Tiny) Improvements for self-Edification Standards! All chairs must be built with an height-adjustable seat, and must contain on one side a small ladder with which the height-challenged folk may lift themself up to be eye-to-eye with their tablemates! Technology would grind to a standstill in favor of magical alternatives, and nature would begin to repopulate the environs.... stuff would glow for no reason at all... and Finally, breaking a pickle-weight-stone would receive the death penalty. (^^)b
Galka - GALKA WOULD SMASH!!!!....the downright demeaning stereotype of this proud people! They would reach a state of refinement that none before had reached, speading the joys of family, brotherhood, and kindness across all the lands! None shall be without the warm feeling gained only from a Galkan heart!
...and they would smash things. Duh.