Based on my interpretation of this website, I believe it's the astronomers. :)
Answer:
Harriet Tubman escaped to freedom in the North in 1849 and then risked her life to lead other enslaved people to freedom.
<span>In the White man's burden, I think that Kipling's true motivation in writing this poem is simply because of the racial dominance and he's also interested in helping others people who are discriminated because of their race. He stated in the White man's burden the racism and also to prevent its destructive effects. </span>
If you could attach the passage, I would be able to help you out more