Final answer:
The correct option is 4). In the U.S., the notable difference in family structure post-immigration for traditional Mexican families compared to Mexican-American families is the increase in the number of women working outside the home. Social and economic factors in the U.S. contribute to this shift towards dual-income households.
Step-by-step explanation:
In the U.S., after immigration, one difference in family structure that is seen between the traditional Mexican family and the Mexican American family is that more women work outside the home. This shift is largely due to the changing dynamics of the labor market and the roles within the household in the U.S. context, where dual-earner marriages have become the norm. The labor market participation and economic conditions in the United States have made it more common for both parents to contribute financially to the family.
Societal views on family have evolved, now including diverse family structures and acknowledging various forms of contribution by all family members. This shift reflects larger trends in the United States towards educational attainment for women and the need for a flexible and mobile workforce.