The US took centre stage again in March — but for all the wrong reasons. Instead of being the engine of global optimism, America became the main source of investor anxiety. Wall Street fell sharply, with the S&P 500 down nearly 6%; dragged lower by tariff talk, recession worries, and an unpredictable policy backdrop under President Trump. Since Trump's return to office, US stocks have dropped almost 20% — the worst start to a presidential term in decades.