Meaning of “heartland” in the English Dictionary

american-english dictionary
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"heartland" in American English

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heartlandnoun [ U ]

us /ˈhɑrtˌlænd, -lənd/

the central or most important part of an area:

The Midwest is the agricultural heartland of the US.

(Definition of “heartland” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"heartland" in Business English

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heartlandnoun [ C ]

uk /ˈhɑːtlænd/ us also heartlands [ plural ]

POLITICS an area where a large number of people support a particular political party and vote for it in an election:

Turnouts were as low as 14% in parts of the so-called heartland.
the Labour/Tory/Republican heartland(s)

an area where a particular industry is very important:

heartland of sth Poland, the Czech Republic, and Slovakia have become Europe's new heartland of carmaking investment.
agricultural/industrial/commercial heartland(s) At the center of India's industrial heartland, the hoped-for flood of jobs has not yet come.

(Definition of “heartland” from the Cambridge Business English Dictionary © Cambridge University Press)