Answer:
The United States is the world's single largest importer and exporter of goods and services, and the largest exporter and importer of business services. It accounts for 14 percent of global goods imports and 9 percent of global services imports. about 16 percent of global GDP in 2015.
That said other countries could lose customers like if the U.S had better products than China then China would lose their customers (other countries that buy goods from them).
If the health in the U.S was really good, they wouldn't need to rely on other countries for help because techinally they would be the ones to give help instead. So basically the point is some countries would lose their customers being the other countries that rely on them for things and would switch to U.S goods and supplies as our stuff would be much better.