Who wrote then I saw the Congo creeping through the black cutting through the jungle with a golden track?

The line

"THEN I SAW THE CONGO, CREEPING THROUGH THE BLACK,

...

CUTTING THROUGH THE JUNGLE WITH A GOLDEN TRACK."

is from the poem The Congo, written by Vachel Lindsay, a poet born in 1879.

See the related links for a link to the text of the poem.