(German: "blood and soil")
Slogan used by the Nazi Party, expressing a fundamental ideal of national socialist ideology, that a "healthy" state requires an identity between the "blood" (the nation, defined on the basis of race/ethnicity) and the "soil" (the territory). The origin of the expression is Walther Darré's book Neuadel aus Blut und Boden (1930), a central work of the racist social-romantic literature so popular in those years.
Blut und Boden-ideology played an important part in Nazi agrarian policy, as well as forming the basis for the idea of the need for Lebensraum ("room to live"), which was used to legitimise the Germanisation efforts in Eastern Europe during World War II.