Anne Godlewska and Neil Smith argue that "empire was 'quintessentially a geographical project. Historical geographical theories such as environmental determinism legitimised colonialism by positing the view that some parts of the world were underdeveloped, which created notions of skewed evolution. Geographers such as Ellen Churchill Semple and Ellsworth Huntington put forward the notion that northern climates bred vigour and intelligence as opposed to those indigenous to tropical climates (See The Tropics) viz a viz a combination of environmental determinism and Social Darwinism in their approach.