Final answer:
The statement that social change in the US is manifested through diversity in family formation is true, as shown by historical shifts such as the market revolution and contemporary changes in family structures.
Step-by-step explanation:
According to the information provided social change in the US is manifested through diversity in family formation and this statement is true. The market revolution is an example of how economic changes influenced social structures, including the formation of families. Moreover, the text implies that changes such as decreasing fertility rates and evolving family structures, whether they pertain to size or makeup, signify broader social transitions. Developments like urbanization and immigration, as well as differing social movements such as the temperance movement, have also contributed to evolving family dynamics. Today, the concept of a "typical" family in the United States differs significantly from historical norms, underscoring the diversity in family formation as a reflection of ongoing social change.