>>214077>>214114Depends on which Kickboxing you're talking about.
The original Kickboxing refers to the Japanese combat sport from 1966 that combined Karate, Kenpo, Muay Thai, Boxing, Judo, and Wrestling. The Japanese incorporated the Thai style of kicking with the full twist of the hips and using the shin as the point of impact as well as clinching & neck-wrestling with elbows & knees. They also utilized foot sweeps, hip tosses, headbutts as well as stuff like jumping kicks from karate/kenpo.
The US variant of Kickboxing was originally called "Full-Contact Karate". It only called itself Kickboxing in the 1980's when Japanese Kickboxing died out and the WKA (the World Karate Association) decided to incorporate elements of J-kick like allowing low kicks compared to the above-the-waist rule that the Professional Karate Association had.
And yes there was a lot of overlap between Karate/Kenpo and TKD/Tang Soo Do. Even in the 1950's and 1960's, TKD and TSD were marketed as "Korean Karate" in the US.
And actually high kicks were more common in Japanese karate. It was the Okinawans that favored lower kicks (no higher than the midriff) because they felt it exposed the crotch and favored hard kicks to the midriff and legs with conditioned heels, insteps, toes, ball, and even the shin. Yes there were cut kicks in Okinawan karate but it wasn't popularized just like how toe kicks were only found in a few styles.