The correct answer is the following.
President Bill Clinton pushed through America´s involvement in the World Trade Organization in 1995 because he believed in free trade and considered an important step for the U.S. economy that would produce many benefits.
The United States were members of the GATT (General Agreement on Tariffs and Trade) since 1948, and under President Bill Clinton became a member of the World Trade Organization on January 1, 1995.