Which country borders the United States to the south?

The country that borders the United States to the south is Mexico. This border stretches for approximately 1,954 miles and includes a variety of geographical features, such as rivers, deserts, and mountains. The U.S.-Mexico border is significant for trade, cultural exchanges, and migration between the two nations.

Canada, while also sharing a border with the United States, is located to the north. Brazil and Cuba do not share a land border with the U.S.; Brazil is located in South America and is not geographically adjacent to the United States, while Cuba is an island nation in the Caribbean, situated to the southeast of the U.S. mainland. Therefore, Mexico is correctly identified as the southern neighbor of the United States.