The Gadsden Purchase. Purchased to provide the Southern Pacific RR with a southern route across the Rocky Mountains.
The smallest expansion of the US border occurred in 1853 with the Gadsden Purchase, where the United States acquired approximately 29,670 square miles of land from Mexico for $10 million. This area, located in present-day southern Arizona and New Mexico, was intended to facilitate the construction of a southern transcontinental railroad. The purchase is notable for its relatively modest size compared to other territorial expansions in US history.
The United States attained its southern border primarily through a series of territorial acquisitions and conflicts. The 1846-1848 Mexican-American War resulted in the U.S. gaining significant territories, including present-day California, Arizona, New Mexico, and parts of Colorado, Nevada, and Utah, solidifying the southern boundary. Additionally, the Gadsden Purchase in 1853 further defined the southern border by acquiring land from Mexico to facilitate a southern transcontinental railroad. These events collectively shaped the current U.S.-Mexico border.
The Treaty of Guadalupe Hidalgo, signed in 1848, resulted in the United States acquiring a significant portion of territory from Mexico, including present-day California, Arizona, New Mexico, Nevada, Utah, and parts of Colorado and Wyoming. This acquisition totaled approximately 525,000 square miles and effectively ended the Mexican-American War. The treaty also established the Rio Grande as the border between Texas and Mexico.
If the question means USA for America then Mexico is on the southern border of the USA.
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The Gadsden Purchase. Purchased to provide the Southern Pacific RR with a southern route across the Rocky Mountains.
Mexico
Arizona shares a border with southern California.
The Ohio River formed the southern border of the Northwest Territory.
The United States purchased the Gadsden Purchase from Mexico in 1854 for $10 million. This territory, which is located in present-day southern Arizona and New Mexico, was acquired to facilitate the construction of a southern transcontinental railroad. The purchase aimed to resolve border disputes and improve relations between the two countries following the Mexican-American War.
Arizona shares its Southern border with Sonora and Baja Califoria, Mexico. To the North Utah shares its southern border with Arizona, and Arizona's western border is marked by the Colorado River to form a border with California and Nevada. The western border of New Mexico is the eastern border of Arizona and Colorado and Arizona touch each other at the Four Corners Monument.
After the Compromise of 1850 the United States acquired both the New Mexico Territory and Utah Territory as parts of its territory. The Mexico and the US border was also agreed on the south.
Texas and Arizona
The State of South Australia completely adjoins the southern border of the Northern Territory.
Needles is in southern California. It is near the border of Arizona.
California, Texas and parts of Arizona and New Mexico.
The two States of Sonora and Baja Caliifornia, Mexico share a border with the state of Arizona. California and Nevada share a border with Arizona that is marked by the Colorado River. Utah's southern border and Arizona's northern border are the same. New Mexico's western border and Ariizona's eastern border are the same and Arizona and Colorado share a border by touching each other at the Four Corners Monument.