When people refer to 19th c. America as "The Melting Pot" to what are they referring?

Question

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2 points
The abundance of metal
The variety of landscapes
The differences of the people
The richness of the soil

Answer 1

When people refer to 19th century America as "The Melting Pot," they are referring to the differences of the people. This term highlights the diverse cultures, ethnicities, and backgrounds that blended together as immigrants arrived in the United States during that time period.