Middle- and upper-class Europeans began to use the language of to describe the working poor that inhabited industrial slums. hist

The correct answer is "Imperialism".

Explanation:

It is the technique of extension or acquisition as well as keeping of colonial possessions, dependents on many an Empire or country through overseas nations.The common vocabulary of imperialism implies the terminology or speech which uses militaristic or some other kind of measures to display colonial characteristics.

Thus, the above is the correct answer.