During Phase 3 of migration to the U.S. (1870-1920) , where did the majority of immigrants come from? 
Definitions:
Human Hearing
The ability of humans to detect and interpret sound waves through a complex process involving the ears and brain.
20 Feet
A measure of length equivalent to approximately 6.096 meters, often used in reference to distance or the dimensions of objects.
Sensory Adaptation
The adjustment of sensory receptors to continuous stimulation, leading to decreased sensitivity to that stimulus over time.
Unchanging Levels
A state or condition where there is no variation, fluctuation, or progression in intensity, degree, or quality over a certain period.
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