The Federal Trade Commission and 17 states sued Amazon, saying its conduct in its online store and services to merchants illegally stifled competition. California, which is not part of the F.T.C. suit, filed a separate lawsuit last year against Amazon.

The ruling did not affect other claims in the antitrust case about Google's  search engine, which is scheduled to go to trial next month.

The Justice Department’s antitrust lawsuit, which California, New York and six other states joined, was the fifth by U.S. officials against the company for anticompetitive practices since 2020.