Ameliorate the Pendleton Civil Service Act

Directions: there are two missing commas. Think about apposition when deciding where the commas should be placed.

The Pendleton Civil Service Reform Act is a United States federal law enacted in 1883 which established that positions within the federal government should be awarded on the basis of merit instead of political affiliation.

Thinglink

suggested answer:
The Pendleton Civil Service Reform Act is a United States federal law, enacted in 1883, which established that positions within the federal government should be awarded on the basis of merit instead of political affiliation.