WASHINGTON—The powerful U.S. Chamber of Commerce filed a brief on Monday, urging a D.C. appeals court to reject an appeal by a big group of United States to revive their antitrust lawsuit against Meta Platform’s Facebook. The Chamber, along with the Computer and Communications Industry Association and Business Roundtable, argued that the district court judge hearing the case was right to toss it out because the states had waited too long to file their case. Judge James Boasberg of the U.S. District Court for the District of Columbia last July dismissed the states’ lawsuit against Facebook, saying they delayed in challenging the acquisitions of Instagram and WhatsApp in 2012 and 2014 respectively. Boasberg, who also dismissed a lawsuit filed by the U.S. Federal Trade Commission, allowed the agency to refile its complaint but did not do so for the states. The group, made up of 46 states, Guam, and the …