50%！美将钢铝进口关税翻倍，引加拿大、墨西哥和欧盟愤怒

Group 1 - The U.S. has increased tariffs on imported steel and aluminum from 25% to 50% to protect domestic industries and address national security threats, effective from June 4 [1][3][4] - Canada and Mexico are expected to be the most affected by the tariff increase, with Canada being the largest supplier of steel and aluminum to the U.S. [5][6] - The OECD has downgraded the U.S. economic growth forecast for 2023 to 1.6% due to the impact of the tariffs and retaliatory measures from trade partners [1][4] Group 2 - The U.S. steel import volume decreased by 17% from March to April 2023, and further declines are anticipated following the new tariffs [4] - The Canadian government has expressed strong opposition to the tariffs, labeling them as illegal and unfair, and plans to support affected workers and businesses [5][6] - The broader impact of the tariffs is expected to increase production costs for U.S. manufacturers that rely on steel and aluminum, potentially leading to higher prices for consumers [7]