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The rise of global technology superstars Amazon, Apple, Facebook and Google created new challenges for the competition watchdogs who enforce antitrust laws. The companies dominate markets in e-commerce and smartphones, search advertising and social-media traffic. An anti-monopoly crackdown that began under President Donald Trump is expected to continue under President Joe Biden, who is surrounding himself with outspoken advocates for vigorous antitrust enforcement against U.S. tech companies.