I don’t have the statistics available, but as I recall reading Goldwater also lost the Panhandle area. He got only about 900,000 votes in TX.
I despise HuffPo, but
https://www.huffingtonpost.com/jim-moore/the-teachings-of-texas-on_b_4632767.html
Nixon may have learned this tactic from his predecessor Lyndon Baines Johnson, who was unable to stomach the fact that Amarillo and surrounding counties voted for Barry Goldwater for president in 1964. Amarillo Air Force Base was ordered closed and most of the operations and personnel were transferred to Shepherd AFB in Wichita Falls, a heavily Democratic county.
Photo at the link
Where once there was an Air Force base (Amarillo)
Johnson, though, had additional motive to act with impunity against Amarillo. His loudest critic, historian J. Evetts Haley, made his home in Randall County. Haley had published A Texan Looks at Lyndon: A Study in Illegitimate Power, which claimed LBJ conspired with West Texas swindler Billy Sol Estes to have murdered three men that might have connected the president to a huge agricultural scandal in the state. The potential witnesses all died mysteriously of carbon monoxide poisoning in their cars. The book was on sale during the presidential campaign and was said to have been outsold in Texas “only by the Holy Bible.”