Examining eugenic and dysgenic trends is a bit of a hobby horse here. Levels of educational attainment, religiosity, alpha vs. beta, and monogamy vs. getting around are a few of the angles we've explored. Jayman recently took a thorough look at fertility trends among blacks, simpliciter style, without adding in a bunch of variables, prompting me to want to do the same with whites and Hispanics. Unfortunately, the sample sizes are too small for the former to have much contemporary relevance, so we'll just consider whites.
The following graph shows the mean number of children among non-Hispanic whites aged 40-65 by wordsum grouping*. All data are from 2000 onward:
Jayman found that among black men, the trend is neutral, while a pronounced dysgenic trend exists among black women. The story is similar among whites, although the dysgenic tilt among white women is gentler than it is among black women.
GSS variables used: CHILDS, SEX, YEAR(2000-2010), RACECEN1(1), WORDSUM(0-3)(4-5)(6)(7-8)(9-10)
* Respondents are broken up into five categories that come to roughly resemble a normal distribution; Really Smarts (wordsum score of 9-10, comprising 13% of the population), Pretty Smarts (7-8, 26%), Normals (6, 22%), Pretty Dumbs (4-5, 27%), and Real Dumbs (0-3, 12%)