Which vice president was arrested for treason?

Answer 1

Arron Burr is the answer

Aaron Burr was tried for treason in 1807. He was charged with treason for allegedly attempting to establish himself as the emperor of an independent nation in the middle of North America (alternately this is described as the Texas area, Mexico, or Louisiana Purchase territories). He was specifically charged with attempting to raise an armed force to capture New Orleans, as well as with charges that he was leading a military incursion into Spanish-held territory.

Chief Justice John Marshall found that Aaron Burr's statements or intent to establish his own country was not illegal and was actually protected by the First Amendment, absent any overt treasonous action. Burr was acquitted for his involvement and many historians still debate what Burr's true intentions were.

Answer 2

Aaron Burr