Sure, the act of conquering territory goes back forever. Perhaps D'Souza's point is that Hitler and the Nazis developed their strategies on how Jackson and the early Democrats treated the native Americans--not that they did it, but how.
Nothing unique about what Jackson did, even in regards the trail of tears.
Pre U.S. the Acadian French underwent a forced migration by the british. Part of the subject of Longfellow’s “Evangeline” poem.
Even further back, you can check the bible to see how Jews were treated by the egyptians.
I generally agree w/D’Souza, but this one’s a stretch.
I’m sure the Nazi’s were running analysis on other countries, just like we do today, concerning what their reactions might be - who might be an ally, who might be neutral, who will be hostile and resist.
If you didn’t know any better, I can see how such analysis would be misconstrued as “inspiration”.