U.S. markets reel as post-Trump optimism flips to historic sell-offs, per QCP Capital. 📉 Bitcoin tests $80k amid wild swings, while falling yields hint at a risky lifeline. 🚨 - S&P 500 and Nasdaq plunge 2.7%/3.8%; "Magnificent 7" lose 830B in a day. - BTC briefly dips below $80k, but traders eye $75k support for rebound bets. - Treasury yields sink 60 bps, weakening USD lifts risk assets despite chaos.