C. The United States and Great Britain
The main way in which the poem, "The White Man's Burden", justifies imperialism to the industrialized world and the unindustrialized world is that it implies that it is the "obligation" and duty of white men in developed and rich countries to colonies poorer countries--in order to implement more "modern" and prosperous forms of government.
The leading argument against slavery during this time in the US was simply that it was immoral, and went against God's will. Another was that it violated the Constitution, and yet another was that it was unsustainable in the South.
