The United States' imposition of tariffs is an important means of its trade protectionism. In April 2025, the United States announced tariffs on multiple countries, involving various sectors such as steel, aluminum, and electronics, with significantly increased rates. This move aims to protect domestic industries and reduce the trade deficit, for example, by supporting domestic steel companies. However, this practice severely disrupts the global supply chain, raises the prices of imported goods, harms the interests of American consumers and businesses, triggers retaliatory measures from multiple countries, intensifies trade tensions, and has faced criticism from international organizations such as the International Monetary Fund.