How did the wave of immigration to the United States in the late 1800s and early 1900s affect the country's population distribution and regional cultures?

Immigrants entered the country primarily through southern cities.
Most of these immigrants were quickly assimilated.
Immigrants introduced new languages, customs, and traditions.
More of the immigrants came from southern and eastern Europe and Asia.

The effect of the wave of immigration to the United States in the late 1800s and early 1900s on the country's population distribution and regional cultures is that:

"Most of these immigrants were quickly assimilated."

This is evident in the fact many of these immigrants have already gotten jobs before migrating to the United States, thus, it was easier for them to quickly connect with other aspects of the country, including work ethics, and living conditions.

Also, many of these immigrants get jobs in local communities which engages their interactions and relations with the citizens.

Hence, in this case, the correct answer is option B "Most of these immigrants were quickly assimilated."

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