Core Viewpoint - The article analyzes the historical impact of tariff impositions on financial markets, focusing on the immediate effects observed in the first month following the implementation of tariffs on various goods from Canada, Mexico, and China [1][2]. Historical Tariff Impact on Specific Industries and Countries - The tariffs imposed in 2018 on solar panels and washing machines had minimal impact on broad market indices, with fluctuations attributed to other macroeconomic factors [2]. - The solar panel tariff led to a 9% decline in the Chinese semiconductor and electrical equipment stock index within the first month, with a 4% drop occurring in the first week [8]. - The washing machine tariff resulted in a 5%-7% drop in stock prices of leading manufacturers in the first month, with a 2%-5% decline in the first week [9]. - The steel and aluminum tariffs caused a 5% drop in the global industrial index in the first month, with further declines in specific country indices [10]. Currency Exchange Rate Effects - Following the implementation of tariffs, the Canadian dollar and euro depreciated by less than 1% against the US dollar, while the Mexican peso appreciated by approximately 6% [11]. US-China Trade War Analysis - During the heightened tariff threats between the US and China from January to June 2018, the US broad stock index fell by 4%, while the Chinese index dropped by 13% [12]. Hypothetical Analysis of Tariff Effects - Historical observations suggest that tariffs on key goods can lead to a 5% decline in related industry stocks within the first month, with leading companies experiencing a 10%-15% drop [13]. - A hypothetical scenario involving tariffs on Mexican automotive imports could result in a 9% drop in the Mexican automotive parts index and a 4% drop in the US automotive parts index [14]. Long-term Tariff and Retaliation Measures Analysis - A scenario involving mutual tariffs between the US and Canada could lead to a 5% decline in the US stock index and a 10% decline in the Canadian stock index, along with a 3% depreciation of the Canadian dollar [16].