the Spanish
The country that controlled territory to the north of the U.S. boundary to the south and west was Mexico. Prior to the U.S.-Mexican War (1846-1848), Mexico held vast lands that included present-day California, Arizona, New Mexico, Nevada, Utah, and parts of Colorado and Wyoming. Following the war and the signing of the Treaty of Guadalupe Hidalgo in 1848, the U.S. acquired a significant portion of this territory.
The territory to the north of the U.S. boundary to the south and west was primarily controlled by Mexico until the mid-19th century. Following the Mexican-American War (1846-1848) and the subsequent Treaty of Guadalupe Hidalgo, the United States acquired significant portions of this land, including present-day California, Arizona, New Mexico, Nevada, and parts of Utah, Colorado, and Wyoming. Prior to Mexican control, this area was part of the Spanish Empire.
Spain controlled the territory from the southwestern US to the tip of Florida. Up until the 19th century, Spain controlled much of the Caribbean and North and South America.
The formal region of Australia refers to the political boundary that defines the country's territory within the continent. It encompasses all the states and territories that make up the Commonwealth of Australia.
Columbia
england
Their is no boundary because North and South Vietnam today because they are one country, hence no border.
the country that is independent is: French Guiana.
Central America and South America
Cyprus
south africa
Lesotho