After World War I (1914-1918), many Europeans came to doubt the morality of the means used to "civilize" peoples. At the same time, the anti-colonial movement, and advocates of indigenous peoples, argued that words such as "civilized" and "savage" were products and tools of colonialism, and argued that colonialism itself was savagely destructive. In the mid-20th century, European attitudes began to shift to the view that indigenous and tribal peoples should have the right to decide for themselves what should happen to their ancient cultures and ancestral lands.