I figured that out in the 1960s when 1950s rock and roll was re-released as C&W music.
I am a Bob Wills -Spade Cooley fan myself, when Western music was real WESTERN!
I PLAY PEDAL STEEL/
I am, too.
Boogie Woogie Blues--Charline Arthur (1950)
Wah Hoo--Bill Boyd & His Cowboy Ramblers (1936)
Kangaroo Blues--Cliff Bruner & His Texas Wanderers (1938)
Dust--Roy Rogers & the Sons of the Pioneers (1938)
"Rock and roll (often written as rock & roll or rock 'n' roll) is a genre of popular music that originated and evolved in the United States during the late 1940s and early 1950s, from African American musical styles such as gospel, jump blues, jazz, boogie woogie, and rhythm and blues, along with country music."
I've never really put much stock in that sort of conventional wisdom that overstates the black roots of rock'n'roll, and only mentions country as an afterthought.
The mainstream pop rock'n'roll that became a teen-centric phenomenon in the 50s evolved most directly from rockabilly, which was really just up-tempo country with electric guitars.
I miss Bob Wills...