when was the 12th amendment ratified
The Twelfth Amendment (Amendment XII) to the United States Constitution provides the procedure by which the President and Vice President are elected.It replaced the procedure of the Electoral College under Article II, Section 1, Clause 3, which demonstrated problems in the elections of 1796 and 1800.The Twelfth Amendment was proposed by the Congress on December 9, 1803 and was ratified by the requisite number of state legislatures on June 15, 1804.Source: Answers.com Added by: bob armour.he Twelfth Amendment (Amendment XII) to the United States Constitution provides the procedure by which the President and Vice President are elected.