Rio Grande.
Rio Grande forms some of the border.
The Yukon River crosses the Canada-US border, but does not form part of it.
The Mississippi River was the western border in 1787.
The Rio Grande forms part of the US border with Mexico, while the St. Lawrence River forms part of the border between the US and Canada.
Which river did Mexico claim was the border between Texas and Mexico
Not quite. The Mississippi river flows through many US states, and some of its tributaries extend into the Canadian border, specifically at the Lake Ontario (New York) or into the Canada-Montana border, as well as into the Gulf of Mexico. If you define the Gulf of Mexico as a border, it would be considered as a border-to-border river, however most borders are defined as the division lines between countries, not between a country an an ocean or sea.
Mississippi River
nothing
Yes, the Rio Grande forms part of the US border. So does the St. Lawrence.
the border is called the Rio grande river!!!
The following are some of the rivers that are in both Canada and the US: Columbia River, Kootenay River, Milk River, Souris River, Red River, Richelieu River. They all cross the Canada/US border at least once, and a few of them do so twice.
The Rio Grande