I want to know the answer to the following question:
The increase in immigrants from what country in southern Europe had a notable impact on the population growth in New Haven in the early 20th century?
All the background I'm provided with is that "(Winchester would continue to produce arms in New Haven until 2006, and many of the buildings that were a part of the Winchester plant are now a part of the Winchester Repeating Arms Company Historic District.)". Is that enough to answer the question?