white man's burden

white man's burden: la carga del hombre blanco

see the English and Spanish wikipedia entries about this, as linked above.

The term comes from Rudyard Kipling's famous poem, which begins:
Take up the White Man's burden--
Send forth the best ye breed--
Go bind your sons to exile
To serve your captives' need;
To wait in heavy harness,
On fluttered folk and wild--
Your new-caught, sullen peoples,
Half-devil and half-child.