Which country is located directly south of the United States?

Mexico is located directly south of the United States, sharing a long border that stretches from the state of California to Texas. This border is significant both geographically and culturally, as it represents not only a boundary between two nations but also a point of economic and social interaction.

The geographical positioning of Mexico makes it a vital player in trade agreements like the United States-Mexico-Canada Agreement (USMCA), which has important implications for the economies of all three involved nations. Mexico's proximity also influences immigration patterns, tourism, and cross-border commerce, emphasizing its essential role in the relationship between the United States and its neighboring countries.

While Canada lies to the north of the United States and Guatemala and Cuba are located further south—Guatemala to the southeast through Mexico and Cuba to the south across the water—they do not share a direct border with the United States, making Mexico the accurate answer.