CNBC Daily Open: The U.S. and Canada skirmish over tariffs, roiling markets

1. S&P 500 reviewed a decline of 0.76% under correction territory. 2. U.S.-Canada tariffs briefly escalated but cooled, impacting market sentiments. 3. Inflation projected to show slight decrease, affecting future economic policies. 4. Geopolitical tensions ease with a proposed Ukraine ceasefire. 5. Technical analysts warn of sustained downturn potential for S&P 500.