The German concept of Lebensraum (German pronunciation: [ˈleːbənsˌʁaʊm] (listen), "living space") comprises policies and practices of settler colonialism which proliferated in Germany from the 1890s to the 1940s. First popularized around 1901,[2] Lebensraum became a geopolitical goal of Imperial Germany in World War I (1914–1918) originally, as the core element of the Septemberprogramm of territorial expansion.[3] The most extreme form of this ideology was supported by the Nazi Party (NSDAP) and Nazi Germany until the end of World War II.[4]