Explain the “white mans burden”

'The White Man's Burden' was a poem by Rudyard Kipling, published in 1899. The poem addressed the United States' shift from isolationism, a foreign policy where countries keep to themselves, to imperialism, a foreign policy where countries expand their influence through peace or force.

a.   it resulted in widespread unemployment.

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.