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mexico
Louisiana
New mexico
Oklahoma
Oklahoma, Arkansas, and Louisiana
Oklahoma shares most of Texas's northern border.
Texas and Louisiana
It is the southern border for Texas; conversely, it is the northern border for Mexico.
Oklahoma
Oklahoma
The Rio Grande, the Red River and the Sabrine apparently :)
Louisiana
No, America's Great Lakes are on her northern border with Canada, and Texas borders Mexico and the Caribbean Sea on America's southern border.
Texas does.
The Republic of Texas extended up into the current state of Wyoming. The Red River and the Arkansas Rivers marked some of the boundaries.