How did Lyndon Johnson alter southern politics? What was it about his being a Texan that influenced him in these actions?

How were Texas’ borders created? What is the history of its distinctive shape?

3 answers

We'll be glad to check your answers.
For the borders, they were set from the Treaty of Guadalupe Hidalgo and the Compromise of 1850 right? I know its border followed the Rio Grande but I don't know much more
http://en.wikipedia.org/wiki/Texas