What was the largest empire of the early american civilization

The largest empire of the early (pre-Columbian) American civilization was the Inca Empire. The Incas called their own empire Tawantinsuyo, meaning 'Land of the Four Quarters' or 'The Four Parts Together'.

United states v.  nixon, 418  u.s.  683 (1974),  was  a landmark  united states supreme court case  that resulted in a unanimous  decision  against president richard  nixon, ordering him to deliver tape recordings  and  other subpoenaed materials to a  federal  district  court.