The removal of the Indians was explained by Lewis Cass--Secretary of War, governor of the Michigan territory, minister to France, presidential candidate: A principle of progressive improvement seems almost inherent in human nature. . . . We are all striving in the career of life to acquire riches of honor, or power, or some other object, whose possession is to realize the day dreams of our imaginations; and the aggregate of these efforts constitutes the advance of society. But there is little of this in the constitution of our savages.