The Sabine River
Sabine Parish, Louisiana was named after the Sabine River. The Sabine River is the border between Louisiana and Texas.
The Red River (Mississippi Watershed) runs from the Texas Panhandle between Texas and Oklahoma and then between Texas and Arkansas and flowing into Louisiana.
The name of the river is the Mississippi River.
Sabine River
Mississippi river Mississippi river
Mexico is located on the southern border of Texas. Texas is also bordered by New Mexico, Oklahoma, and Louisiana.
the red river is the intended answer but technically only the vegetation line on its right bank forms the border the river itself is entirely within Oklahoma everywhere between the Texas panhandle & Arkansas
Atchafalya river in louisiana
Sabine River
The three major rivers in Louisiana are the Mississippi River, the Red River, and the Atchafalaya River.
Most of this 3,141 Kilometers (1,952 miles) border is defined by the course of the Rio Grande River (Rio Bravo del Norte, as it is known in Mexico) which runs from Ciudad Juarez-El Paso into the Gulf of Mexico, close to the cities of Matamoros-Brownsville.
Louisiana PurchaseIt wasn't as much who as it was what. The Louisiana Purchase urged Americans to settle around the Red River. Although Texas belonged to the Spanish, Thomas Jefferson declared the river a runoff to the Mississippi, thus making it neutral. I suppose if you need the name of actual persons, you would be looking for Moses and Stephen Austin. They brought patent holders into the state in their empressario.