"The United States became a Superpower within a century of the Civil War because of racism." Is this statement valid? I need one example from the Post Civil War Period (1865-1896), one example from the turn of the century (1896-1939), and two examples from the modern era (1939-1980). A brief outline should be good :). Just need the four examples discribed very briefly supporting your position for the thumbs up :). More than one answer is welcomed!