In the history of the United States there have been fewer than 40 federal prosecutions for treason and even fewer convictions. Several men were convicted of treason in connection with the 1794 Whiskey Rebellion but were pardoned by President George Washington. The most famous treason trial, that of Aaron Burr in 1807 (See Burr conspiracy), resulted in acquittal. Politically motivated attempts to convict opponents of the Jeffersonian Embargo Acts and the Fugitive Slave Law of 1850 all failed. Most states have provisions in their constitutions or statutes similar to those in the U.S. Constitution. There have been only two successful prosecutions for treason on the state level, that of Thomas Dorr in Rhode Island and that of John Brown in Virginia. http://en.wikipedia.org/wiki/Treason