The United States stock market sell-off escalated following a subpoena issued by the Department of Justice (DoJ) to semiconductor giant Nvidia (NASDAQ: NVDA). Given Nvidia’s significance in the stock market, its legal woes will likely escalate losses for many equities.The DoJ issued the subpoena to investigate potential concerns related to Nvidia’s dominance in the artificial intelligence (AI) space.The government is searching for evidence that the technology giant violated U.S. antitrust laws. This develop ...