The history of the expression "the fFnal Solution.. " is much longer than most realize. The Nazis adopted it as an homage to the battle plan carried by Sherman when he and Custer and the bloodthirstiest of the post civil war Northern army were sent West to deal with "Indian Problem". There are a few decent texts on the subject and can be searched via duck duck go using the full name "The final solution to the Indian Problem".

Btw, I'm not mentioning that in any way to support the Zionism claim. Just that the expression does have it's roots way back in the century before the Nazis arose. During the US genocide of the natives which began shortly after the Civil War and, oddly, continues to today. As can be seen in any news coming out of Standing Rock in the last 10 years or so.