The trade war between the United States and China began in 2018 and has escalated over time with both countries imposing tariffs on billions of dollars worth of each other's goods. The trade war has had mixed effects on both economies, hurting some industries but boosting others. It has also slowed global economic growth and disrupted international supply chains. While some short-term gains have been made by both sides, the long-term costs of a prolonged trade war could outweigh any benefits as it damages economic relationships and cooperation.