Well it is actually steamboat Willie, I don't know when it was made. The first Disney Princess movie was Snow White but not the first Disney movie. And wasn't Fantasia made before Snow White too?
yes, Snow White is first full-length Disney movie but if wewe mean first The Walt Disney Company's uhuishaji so I think that it is "Osward the Lucky Rabbit"
if wewe watch the movie Tangled and wait until the very end, there is a countdown of the Disney sinema from the 50th one (tangled) to the first one (snow white)