Answer:
Description 1: "This need grew with the growth of the population" -: Skilled workers
Description 2: "Largest group of immigrants" -: Slaves
Step-by-step explanation:
In the United States or Western Hemisphere contest, it is widely known that aside from European colonists or settlers, the largest group of immigrants are the slaves, which was a result of the majorly trans-Atlantic slave trade from West African territory.
On the other hand, in the process of developing the region of the United States and Western Hemisphere generally, there is a need for skilled workers in the industrial sectors of the country. For example infrastructural development, health care system, etc.
Hence, the correct answer in this case is:
Description 1: "This need grew with the growth of the population" -: Skilled workers
Description 2: "Largest group of immigrants" -: Slaves