Final answer:
Blood type is an example of a human difference that does not lead to social stratification in American culture, remaining a non-influential factor in a person's social status or opportunities.
Step-by-step explanation:
An example of a human difference that has NOT led to social stratification in American culture is blood type. Unlike visible characteristics such as skin color or religious and cultural practices that have historically contributed to stratification, blood type, an invisible genetic marker, does not influence one's social status or opportunities in American society. Biological anthropologists confirm that there's no scientific basis for using these kinds of genetic differences to categorize people socially.