A more thorough explanation:

The Evarts Act is a law passed by the federal government in 1891. It created the circuit courts of appeals, which are now known as the U.S. courts of appeals. This law also established the way that federal appeals are reviewed today.

For example, if someone is unhappy with a decision made by a federal court, they can appeal to a higher court. The Evarts Act created the system for how those appeals are heard and decided.

The Evarts Act is important because it helps ensure that the federal court system is fair and consistent. It also helps to prevent any one court from having too much power or influence.