In his book "Coloniser, Exterminer" (2005) Le Cour Grandmaison states that techniques and concepts used during the period of late 19th-century New Imperialism were later used during the Holocaust. He points to both Tocqueville and Michelet who spoke of "extermination" during the colonization of the Western United States and the removal of Native American tribes. He quotes Tocqueville's 1841 comment on French conquest of Algeria: