Final answer:
The specific percentage of births to unmarried couples in Texas in 2011 isn't provided, but with 4% of children nationwide living with couples who are not married and the trend of cohabitation increasing to 11.5% of the population, it suggests a noteworthy portion.
Step-by-step explanation:
The percentage of births in Texas in 2011 to couples who were not married was not directly provided in the reference material. However, it is mentioned that nationally, 4 percent of children live with couples who are not married. If we consider this statistic alongside the increasing trend of cohabitation and the percentage of children living in single-parent households, it can be inferred that a significant proportion of births in Texas in 2011 may have been to unmarried couples.
It is important to note that the trend of cohabitation has been increasing, with an estimated 11.5 percent of the population living together in a sexual relationship without being married in 2011 according to the U.S. Census. Additionally, the U.S. Census Bureau reported a decrease in social stigma associated with cohabitation based on a 2010 survey. With fewer individuals opting for marriage and the growing acceptance of cohabitation, it can be assumed that the percentage of births to unmarried couples in Texas likely reflects these national trends.