Never. In order for an amendment to be properly ratified, it must be ratified in its EXACT language, by 3/5 of all of the states. While it seems that enough states did ratify a variation of the amendment in some form or another, it was never ratified in its exact language by enough states.
This did not, however, prevent it from being added to the Constitution, and becoming de facto "law".
It was never properly ratified.
There are various institutions offering enormous cash rewards to anybody who can prove otherwise, as of yet, no takers.
The Sixteenth Amendment, ratified in 1913.
The Fourteenth Amendment was ratified in 1868.
The Sixteenth Amendment
It was ratified in 1781.
It was ratified!
It was ratified in 1804.
One economic amendment has been ratified.
the 18th amendment was ratified on january.16,1919
The last amendment, which is the 27th Amendment to the United States Constitution, was ratified in 1992.
Duing the Reconstruction period; 1865, 1866, 1869.
It took seven years for the second amendment to be ratified.
By the early 1900s, political support had broadened to include progressive Republicans. The Sixteenth Amendment, which legalized an income tax, was submitted to the states in 1909 and ratified in 1913.