melting pot

Từ điển Oxford Advanced Learner 8th

ˈmelting pot [melting pot melting pots] BrE NAmE noun usually singular
a place or situation in which large numbers of people, ideas, etc. are mixed together
•the vast melting pot of American society
Idiom: ↑in the melting pot

Culture:
The phrase ‘the melting pot’ has been used to describe the US, because it is a country in which people from many different races and cultures are ‘melted’ together, i.e. mixed, to form the US people. The British writer Israel Zangwill (1864–1926) wrote a play called The Melting Pot (1903) about Jewish immigrants in America.