Fed chair says Trump tariffs could make inflation worse as US stocks slide further

**Summary:** - US Federal Reserve Chair Jerome Powell warned that Donald Trump's tariffs could worsen inflation and create an uncertain economic environment. - US stock markets fell, with the S&P 500 down 2%, Nasdaq down 3%, and Dow Jones down 1.7% after his comments and new trade restrictions on Nvidia. - Nvidia lost billions in market value as it expects a $5.5bn hit due to US restrictions on its chip sales in China. - The sell-off spread to Asian and European semiconductor makers, with companies like Samsung, SK Hynix, TSMC, and ASML seeing declines. - The World Trade Organization warned that Trump's tariffs will decrease global trade and economic growth this year. - Despite market declines, US retail sales rose 1.4% in March, and oil prices increased amid hopes of China-US trade talks. - California launched a legal challenge against Trump's tariffs, claiming they threaten state trade. - Trump is set to attend a trade meeting with Japanese officials, discussing tariffs and military support costs.