The truth about immigrants?

Dana Kramer-Rolls says on Facebook:

Dr. Ben Carson got into some trouble by saying that black slaves were immigrants, too. But I heard poetry and wondered what Maya Angelou would have made of it. I'm not her, but here is my take.

They came as immigrants,

Stolen by invaders, sold by their kings.

They came as immigrants,

Chained in the holds of ships, the living and the dead.

They came as immigrants,

Sold, beaten, families torn apart.

They came as immigrants,

The religion of their mothers mocked and forbidden.

They came as immigrants,

Now the chains were broken, but they were still lynched, shot.

And then it began again.

They come as immigrants.

Fleeing invaders, fleeing the bombs.

They come as immigrants,

Washed up on shores, the living and the dead.

They come as immigrants,

Their religion mocked, families torn apart.

They come as immigrants,

They think they are safe, but still they are beaten and shot.

Will it ever end?