Two answers to this question.

The original line comes from Virgil's Aeneid.

The other answer is Enoch Powell, who used that line in a speech, that became known as the 'Rivers of Blood' speech, in 1963. Powell never used the line 'Rivers of Blood', you can blame the British press for that.

Blood Red Rivers was created in 1997.

Blood Red Rivers has 328 pages.

Only people that agreed with him in the fact that migrants are going to cause huge riots in the future with 'rivers of blood' hence the fact that this is the name of his speech.

no they drink from their blood