Which amendment was the only one to be repealed since the Constitution was ratified?

The only amendment to be repealed since the Constitution was ratified is the amendment concerning alcoholic beverages, which is the 18th Amendment, enacted in 1919. This amendment prohibited the manufacture, sale, and transportation of intoxicating liquors. It was repealed by the 21st Amendment in 1933 because of various factors, including the rise in organized crime associated with illegal alcohol and a growing public sentiment that prohibition was not working, leading to its unpopularity.

The other amendments mentioned either have not been repealed or are not relevant to the context of repeal. The civil rights amendments, such as the 13th, 14th, and 15th, aimed to secure rights for former slaves and have remained integral to the Constitution. The amendment on women's suffrage, the 19th Amendment, established women's right to vote and has been crucial in shaping voting rights in the U.S. The amendment regarding income tax, the 16th Amendment, established the federal income tax and remains in effect as a significant source of government revenue. Therefore, the amendment concerning alcoholic beverages stands out as unique in being the only one to have been officially repealed.