In the early 1980s, there were two major antitrust settlements that significantly impacted the evolution of the computer industry. The first was the the U.S. Department of Justice’s decision to withdraw its long-running antitrust case against IBM, which began in 1969. That lawsuit focused on IBM’s dominance in the mainframe and minicomputer markets, and the government’s retreat helped clear the path for IBM to aggressively enter the microcomputer market with the IBM PC.