Final answer:
The amendment in 1988 referred might be the Civil Liberties Act of 1988, which offered compensation to Japanese Americans incarcerated during WWII. This was not a constitutional amendment. If we go strictly by constitutional amendments, none were ratified in 1988.
Step-by-step explanation:
The amendment added to the legislature in 1988 was not an addition to the Constitution but rather an Act of Congress known as the Civil Liberties Act of 1988. This legislation was passed in response to the incarceration of Japanese Americans during World War II. It served as a formal apology from the government and established a trust fund for the compensations of these individuals.
However, in the context of amendments to the U.S. Constitution, it's worth noting that there have been no successful constitutional amendments since the Twenty-Seventh Amendment in 1992. If you're referring to the addition of a protected class to existing laws, then the Civil Rights Act of 1964 was modified in the latter half of the 20th century to include more groups (such as individuals of different national origins and women, which are implied in the provided text).
Learn more about Civil Liberties Act of 1988