But white two-parent households have four and a half times the wealth of white single-parent households.

If you can't even accumulate wealth when white unless you're married (when you have children), what chance do you have if you're unmarried and not white, given the residual inequities in society?

(Of course, even though there are huge differences in the median, there are also huge differences between the 50th and 75th percentile--if you're black and in the 80th percentile, you have about as much wealth as if you're white and in the 50th. It's not impossible, just harder than it should be.)

Being married might not be enough, but it still might help a whole lot. It helps white people immensely, according to your own link.