What is meant in kipling's poem "the white man's burden"

The White Man's Burden' was a poemby 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

Both built large militaries ( militarism) and japan, like germany, invaded neighboring countries (china, philippines) in order to build a new empire.