I want to know the answer to the following question:
In what century did some German-trained classicists in the US suggest modifying the common usage to Vergil?
All the background I'm provided with is that "In the 19th century, some German-trained classicists in the United States suggested modification to Vergil, as it is closer to his original name, and is also the traditional German spelling.[citation needed]". Is that enough to answer the question?
Answer: yes