Religous Right to explode

Here is why

But last year teens accounted for just 24 percent of unwed births, down from 50 percent in 1970, she commented.

The increases in unmarried births have been among women in their 20s, she said, particularly those 25 to 29.

Many of the women in that age group are living with partners but still count as unmarried mothers if they haven't formally married, Ventura noted.

The 20s are the prime childbearing years, regardless of whether the mother is married or not, she said. ...
There were 1,470,152 babies born to single women in 2004, 35.7 percent of all births in the country, NCHS said. That was up from 1,415,995 a year earlier.

I am not sure what they will blame but I am guessing gay marriage and homosexuals

I blame the decay of the family social structure in general