The Murray River borders Victoria and New South Wales.
The Columbia River borders most of the length between Washington & Oregon.
Yes, Iowa and Nebraska share a border along their eastern borders. The Missouri River serves as the boundary between the two states for much of their shared border.
The Rio Bravo (Mexican name) or Rio Grande (U.S. name). It flows along the southern boundary of thes State of Texas all the way to the Gulf of Mexico. To the west of Ciudad Juarez/El Paso, where the river begins forming the border, the U.S.-Mexican Border is a series of high deserts, ending at the Pacific Ocean.
The border argument before the Mexican-American war was over which river divided Mexico from Texas. The Americans claimed that it was the Colorado river, but that was not the case. The Americans crossed into Mexico and were fired upon. America then declared war, this resulted in the Mexican-American war which was won by America and as a result took much more land.
The Mexican border is fenced up to 2000 miles long.
Much of the border between Oklahoma and Texas is the Red River.
Sabine River
enough to beat a Mexican
Mississippi river
the indus river
From what I know, it is not a river that forms much of the border. It is the Bitterroot mountain range.