"White Man's Burden" was also used to justify the Spanish-American War which gave the US Puerto Rico, the Philippines, Guam, etc.  In fact, the poem was sent to Teddy  Roosevelt.

"Kipling offered the poem to Theodore Roosevelt, then governor of New York state (1899–1900), to help him politically persuade anti-imperialist Americans to accept the annexation of the Philippine Islands to the United States."

Of course, there is also pretty good case to be made that the war was pushed along to help both Pulitzer and Hearst  to sell newspapers.  

https://en.wikipedia.org/wiki/Yellow_journalism