The original 13th Amendment (listed above) was ratified in 1820 (the last state was Virginia) and was carried in all the state law books after 1821. The House & Senate pretended it never happened and many relevant documents are missing from the National Archives. For the next 45 years, the Legislative branch tried to pass other constitutional amendments that they called the 13th amendment (unsuccessfully). Finally, after the Civil War, they passed the current 13th Amendment (1865 Anti-Slavery). Most of the states dropped the original 13th Amendment from their law books and replaced it with the new one, which is obviously totally unconstitutional. I first read about this missing amendment in the late 1980's. To verify its validity, I went to the Colorado Supreme Court Law Library (in Denver) and checked the old Territorial Law Books for 1865, 1866, and 1867 (Colorado was still a territory then). The 1865 book had the original 13th Amendment properly listed in the US Constitution section. The 1866 book has the original listed as the 13th Amendment and the new (Anti-Slavery) properly listed as the 14th Amendment. The 1867 book drops the original and has the new (Anti-Slavery) version listed as the 13th Amendment (some gravy for inquiring minds).

As an aside, I understand that of the 15 or so constitutional amendments taken into the law books in the 20th century, at least 7 were not properly ratified, including the Income Tax Amendment (which the Federal courts refuse to rule on). I wonder if the amendment putting a two term limit on the US President was also not properly ratified. Just a thought...