SYDNEY, Feb 23 : Wall Street futures and the dollar slid in Asia on Monday as confusion over U.S. tariffs revived the "sell America" trade, while confidence in the entire AI sector was set to be tested by results from tech-diva Nvidia this week. Gold gained and oil prices eased ahead of another round of talks between the United States and Iran due in Geneva on Thursday, with the risk of U.S. military strikes lingering if a deal is not done. Uncertainty loomed large after the U.S. Supreme Court