What piece of legislation allowed many states to practice racial segregation?

Jim Crow laws allowed the states to practice racial segregation.

Jim Crow laws were created by state and federal government leaders who were white and prejudiced after the Civil War and the period known as Reconstruction.
These laws were enforced all over the United States and made it legal to segregate people by color in public spaces. Examples include public buildings, theaters, restaurants, buses and trains, schools, etceteras.
Jim Crow laws were in place and enforced until 1964-65.

The word panel has 8 definitions.

Explanation:

1. sheet that forms a distinct (usually flat and rectangular) section or component of something

2. a committee appointed to judge a competition

3. (law) a group of people summoned for jury service (from whom a jury will be chosen)

4. a group of people gathered for a special purpose as to plan or discuss an issue or judge a contest etc

5. a soft pad placed under a saddle

6. a piece of cloth that is generally triangular or tapering; used in making garments or umbrellas or sails

7. (computer science) a small temporary window in a graphical user interface that appears in order to request information from the user; after the information has been provided the user dismisses the box with 'okay' or 'cancel'

8. electrical device consisting of a flat insulated surface that contains switches and dials and meters for controlling other electrical device