Final answer:
In Crevecoeur's description of American immigrants, the aspect that is very different today is the immigrants' attitude toward becoming American.
Step-by-step explanation:
In Crevecoeur's description of American immigrants, the aspect that is very different today is the immigrants' attitude toward becoming American. According to the description, immigrants in the past viewed assimilation into mainstream society as a necessity for success. They believed in the American Dream and saw it as a way to improve their lives. However, today, there is a more diverse range of attitudes towards becoming American, with some immigrants advocating for the preservation of their cultural identity rather than assimilation.