The Gulf of Mexico is south of the United States of America.
To find out which country is south of the Gulf of Mexico, we can refer to a map or use an online mapping tool. The Gulf of Mexico is located in the western part of the Atlantic Ocean, bordered on the north by the United States. So, if we move south from the Gulf of Mexico, we will find the country of Mexico. Therefore, Mexico is the country that lies south of the Gulf of Mexico.
