"On 23 April 1942, the Reichsführer-SS, Himmler, penned a memorandum in Hitler’s headquarters on ‘The retrieval of Volksdeutsche from America and Africa after the war’. ‘It is our task,’ the Reichsführer announced, ‘to bring back every person of German blood who has any value at all, in order to settle the captured acres.’ This could not be done by the Nazi Party because the main target group of albeit ‘politically unquestionably contaminated Volksdeutsche’ lay in ‘America’, beyond the political control of the Reich. Instead, Himmler called for ‘personal recruitment’ through family ties. Himmler was acknowledging the deep entanglement of Germany with America in one breath and demanding their disentanglement in the next.
[...]
In late July 1942, Himmler presented Hitler with the revised version of the Generalplan Ost, with detailed maps and plans for the construction of settler villages. An important part of these plans was the resettlement of German-American returnees, who were deemed to have the right qualities of hardiness and initiative to colonize the steppes as their forefathers had once settled the plains. Some of the planned settlements were thus to be called ‘USA-Colonies’. ‘The Führer not only listened to me,’ Himmler said shortly afterwards, ‘he even refrained from constant interruptions, as is his usual habit.’ Hitler approved the plan."
— Brendan Sims, Hitler: Only The World Was Enough

So Hitler wanted to resettle the newly conquered territories with Germans and Nords, not just from Europe but also from the USA.

"... according to Goebbels, Hitler said that he was ‘determined to give the Soviets the coup de grace this summer’. Victory in the East was the basis for the ‘creation of a new Eastern Marches’, for which Hitler sketched out grandiose future prospects: ‘There we shall hugely extend our land. There we shall acquire coal, grain, oil and above all national security. . . . A shrewd population policy, above all using the resettlement of ethnic Germans, could within sixty, seventy years easily increase the German population to 250 million.’ However, according to Hitler, they should ‘not believe that with this war all war would be abolished. In future too, war would still be the father of all things.’"
— Peter Longerich, Hitler A Biography

For more info: 'Monologe im Führerhauptquartier 1941–1944: Die Aufzeichnungen Heinrich Heims, ed. Werner Jochmann'

'Hitlers Tischgespräche im Führerhauptquartier, ed. Henry Picker'