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

The muslims ruler the mandated and cultural toleration was osman