I did find the following, which is not quite "it" but which is perhaps related:
"Because of the baby bust of 1965-1982, there are now fewer non-Hispanic white women in the child-bearing years. White and Asian birthrates are below replacement, black fertility at the 2.1 replacement while Hispanic fertility is 2.99, almost 50% higher than replacement fertility. The large number of Hispanic women in their child-bearing years will increase the number of Hispanic children that are born. "
This is from the Population Resource Center, May 8, 2010.
Thanks. I didn’t realize there was a baby bust from ‘65 to ‘82. Those years roughly correspond to major acceleration of the women’s lib movement when women abandoned the home in droves to search for fulfillment in the men’s world of work. In the year 2000 census there was a 12 or 13 percent increase in the number of women staying home compared to 1990. I don’t know if that is due to more immigrants or to white American women. Even so white women aren’t having children like Hispanic women are. Hispanics still value family more so than Whitey. I know a lady (white) who has a daughter in college who isn’t going to have children because they are too much work.