An idea used to justify the ever-westward spread of american citizens was called:

the answer would be 50's sitcoms reinforced traditional roles for men and women.

according to the quotation from booker t. washington's 1895 atlanta compromise speech.

in the great leap from slavery to freedom . . the masses of us are to live by the production of our hands . . we shall prosper . . as we learn to dignify and glorify common labor.

washington believed that  hard work had its own kind of dignity.

explanation:

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