今夜，沸腾了

Group 1: Federal Reserve and Market Reactions - The Federal Reserve's Chairman Jerome Powell signaled a potential shift towards a dovish stance, indicating that the market's expectations for a rate cut in September are likely to be realized, with a 25 basis point cut being anticipated [6][7][9] - Following Powell's remarks, the stock market experienced significant gains, with the Dow Jones rising nearly 1000 points, and the Nasdaq increasing by approximately 2% [1][2] - The expectation of a rate cut has led to a sharp decline in the US dollar index, which fell by 0.9006% to 97.7623 [5][6] Group 2: Canadian Tariff Changes - Canada announced the cancellation of several retaliatory tariffs on US goods that comply with the US-Mexico-Canada Agreement (USMCA), aiming to ease tensions with the US [11][12] - This policy shift indicates a significant change in Canada's approach to US trade relations, moving away from a previously aggressive stance against US protectionism [12] - However, Canada may retain tariffs on US steel, aluminum, and automobiles, which were previously imposed by the Trump administration [12]