A government in exile is a political group which claims to be a country's legitimate government, but is unable to exercise legal power and instead resides in a foreign country. Governments in exile usually plan to one day return to their native country and regain formal power. A government in exile differs from a rump state in the sense that a rump state controls at least part of its former territory. For example, during World War I, nearly all of Belgium was occupied by Germany, but Belgium and its allies held on to a small slice in the country's west. A government in exile, conversely, has lost all its territory.