When does a minority become a majority?

http://www.bbc.co.uk/news/world-us-canada-18100457#
This article kinda suggests that the nice stable world of white middle class America just became a significant minority.
The current birthrate figures suggest that in just twenty or so years, the USA will become a place where white people are the minority. This may be a good thing and teach them to get along with their neighbors a little better.
As a "wetback" myself, or at least, that was the perception I had as an H1B Visa holder in the US, I can well appreciate the prejudice that can be levied upon one if "y'all ain't from around here are ya?" Perhaps a majority of people who don't follow the conservative white ideals will breathe a breath of fresh air into a nation so set upon it's quasi-aryan supremacy.