Answer:
4. Two
Explanation:
- The first major wave of immigration occurred in 1815
The majority of the immigrants come from Ireland, which accounted for around 33% of the total immigrants in that year.German immigrants took the second place with around 5 million people in total.
- The second major wave of immigration occurred in 1880
The majority of immigrants come from east and central Europe. Around 4 million people from Italy and 2 million Jewish people came to united states during this period.
