Answer: "new" wave of immigration, which started in the late 1800s.
Step-by-step explanation:
In the late 1800s, The United States saw a new wave of immigration that was distinct from the old wave of the early 1800s. The new wave of immigration was from countries in Eastern and Southern Europe such as Italy, Russia, Poland and Greece.
The new wave of immigration unlike the old wave, consisted on mainly younger people who were illiterate, unskilled and poorer. Their religions were mostly Orthodox Christianity, Catholicism and Judaism.
Looking at the map, the countries highlighted in Europe are towards the East and South which is why this represents the New Wave.