Stock market posts third biggest gain in post-WWII history on Trump's tariff about-face
1. S&P 500 surged 9.52% after Trump's tariff pause announcement. 2. The one-day gain ranks third largest since WWII. 3. Investors see this as a pivotal moment for market clarity. 4. SP500 briefly hit bear market territory prior to this rally. 5. Ongoing trade negotiations could bring mixed outcomes.