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.

it is the dominance of   the spanish language and roman catholic region in mexico, french being the official language of several african countries, and the existence of a western-style government in south asian countries