The southern neighbor of the United States is Mexico. It shares a lengthy border with the U.S., stretching approximately 1,954 miles. This border spans four U.S. states: California, Arizona, New Mexico, and Texas.
If the question means USA for America then Mexico is on the southern border of the USA.
Southern state did not require school to be integrated
California is a northern state.
Brownsville in Texas is the southern most point.
Slavery!
Himachal Pradesh
Mexico is the southern neighbor of the U.S.
Mexico.
The closest southern neighbor would be Mexico.
USA is the closest southern neighbor of Canada.
alabama
Egypt.
South African Republic (SAR) is Botswana's southern neighbor. http://www.mapsnworld.com/world-map-political.html
Colorado is bordered by New Mexico to the south. Denver is the capital city in Colorado.
Mexico is the southern neighbor of the U.S.
Panjab
armenia