The term "Lebensraum" was a major motivation for Adolf Hitler's Germany with their aggression towards gaining additional territory. "Mein Kampf" written by Adolf hitler, he makes it extremely clear that he believes that Germany needed Lebensraum for a greater Germany. land, and raw materials. In the policy of the Nazi's, it's mentioned to repopulate land with racially pure German people. The term Lebensraum, talking about sufficient space, was coined by Friedrich Ratzel in 1901, and was used as a slogan in Germany referring to the unification of the country and the acquisition of colonies, based on the English and French models. Also, in "Mein Kampf" Hitler expresses the link between the concpet of Lebensraum and his own brand of racism and Social Darwinism.

Sources
Layton, Geoff. Weimar and the Rise of Nazi Germany. 3rd Edition. London. Hadder, 2005.