Aaron Davidson, one of a handful of Americans implicated in United States prosecutors’ world soccer corruption case, pleaded guilty to racketeering conspiracy and wire-fraud conspiracy charges in federal court in Brooklyn on Thursday.

His conviction was the 20th to be announced by the Department of Justice in its far-reaching prosecutions of sports officials and business executives connected to FIFA, soccer’s global governing body, and affiliated regional organizations.

Mr. Davidson, 45, a sports marketing executive, admitted to negotiating and paying more than $14 million in bribes to soccer officials on behalf of Traffic Sports USA, a firm headquartered on Brickell Key, a private island in Miami where Mr. Davidson lives.

Those bribes helped Traffic secure lucrative media and marketing contracts, including the rights to major international tournaments. Mr. Davidson, who began working for Traffic as a salesman in 2003, said on Thursday that he had learned about the company’s practice of paying bribes for business in 2009 and that he had begun participating in such schemes in 2012.