For the first time, white births were lower than births of minorities.
Typically, when people use terms like minorities, they're referring to groups that have been disadvantaged in some capacity over history. Women were never a minority in numbers, but are still called a minority group.
If the population changes and Hispanics outnumber whites, would people still refer to them as a minority? Tannen believes so, "that's how language works, it becomes its own meaning regardless of how the actual numbers or facts are."
But if the change is dramatic, it could be changed by the people within that group. For example, like how African-Americans were called colored, then negro, then afro-american.