The USA is called the melting pot because it is a diverse country with people from many different ethnicities, cultures, and backgrounds coming together and mixing to create a unique American identity.

Yes, the USA is often referred to as a country of immigrants because the population is made up of people who have come from all over the world to live and work in the United States.

Immigrants in the USA come from a wide range of countries, including Mexico, China, India, the Philippines, El Salvador, Vietnam, and many more.