Opening post:
In Mein Kampf Hitler hasn't claimed to destroy any of the nationalities, just fight so Germanic Race can survive, his plan for Jews was to send them to Madagascar not kill them, but other Great Powers didn't agree and Hitler didn't controlled Madagascar.
He said Germany needs 500,000 km2 more land so it can compete with USA and British Empire, but when his plan of Germanic Reich (unite all Germanics except for British and regain 1914 lands) would become truth, he would exceede the number.