This passage is a commentary on what era in United States and World History?

Here is the passage:

The White Man's Burden

Rudyard Kipling, 1899

Take up the White Man's burden--

Send forth the best ye breed--

Go bind your sons to exile

To serve your captives' need;

To wait in heavy harness,

On fluttered folk and wild--

Your new-caught, sullen peoples,

Half-devil and half-child.

Take up the White Man's burden--

In patience to abide,

To veil the threat of terror

And check the show of pride;

By open speech and simple,

A hundred times made plain

To seek another's profit,

And work another's gain.

This passage is a commentary on what era in the United States and World History?

Answer: The passage is about European imperialism in the nineteenth and early twentieth centuries.