A more thorough explanation:

USTR

USTR is an abbreviation for United States Trade Representative. This is a government position responsible for negotiating and enforcing trade agreements between the United States and other countries.

One example of the USTR's work is negotiating the United States-Mexico-Canada Agreement (USMCA), which replaced the North American Free Trade Agreement (NAFTA) in 2020. The USTR also works to address trade issues with China, such as intellectual property theft and unfair trade practices.

Another example is the USTR's involvement in the World Trade Organization (WTO), where they represent the United States in negotiations and disputes related to international trade.

The examples illustrate how the USTR is responsible for negotiating and enforcing trade agreements on behalf of the United States. The USMCA and WTO examples show how the USTR works with other countries to address trade issues and create fair trade policies. These examples demonstrate the importance of the USTR in promoting and protecting the interests of the United States in international trade.