Settler colonialism is a form of colonial formation whereby foreign people move into a region. An imperial power oversees the immigration of these settlers who consent, often only temporarily, to government by that authority. This colonization sometimes leads, by a variety of means, to depopulation of the previous inhabitants, and the settlers take over the land left vacant by the previous residents. Unlike other forms of colonialism, the ""colonizing authority"" (the imperial power) is not always the same nationality as the ""colonizing workforce"" (the settlers) in cases of settler colonialism. The settlers are, however, generally viewed by the colonizing authority as racially superior to the previous inhabitants, giving their social movements and political demands greater legitimacy than those of colonized peoples in the eyes of the home government.Land is the key resource in settler colonies, whereas natural (e.g. gold, cotton, oil) and human (e.g. labor, existing trade networks, convertible souls) resources are the main motivation behind other forms of colonialism. Normal colonialism typically ends, whereas settler colonialism lasts indefinitely, except in the rare event of complete evacuation (e.g., the Lost Colony of Roanoke) or settler decolonization. The historian of race and settler colonialism Patrick Wolfe writes that ""settler colonialism destroys to replace"" and insists that ""invasion"", in settler colonial contexts, is ""a structure, not an event"".This definition, by contrast, comes from the Settler Colonial Studies website:Settler colonialism is a global and transnational phenomenon, and as much a thing of the past as a thing of the present. There is no such thing as neo-settler colonialism or post-settler colonialism because settler colonialism is a resilient formation that rarely ends. Not all migrants are settlers: settlers come to stay, and are founders of political orders who carry with them a distinct sovereign capacity. And settler colonialism is not colonialism: settlers want Indigenous people to vanish (but can make use of their labour before they are made to disappear). Sometimes settler colonial forms operate within colonial ones, sometimes they subvert them, sometimes they replace them. But even if colonialism and settler colonialism interpenetrate and overlap, they remain separate as they co-define each other.