There is no comprehensive study, or compiled data to support a definitive answer to this question since Martial Art systems, schools, and practitioners are constantly growing and changing. Even the very definition of what a Martial Art is has evolved in recent times. It is difficult for experts to agree, and the world is filled with novice practitioners who define things very differently.
Speaking to the nature of unarmed combat Martial Art systems, some of the more predominant countries have been China, Korea, Japan, Philippines, United States, Canada, and the United Kingdom. Often times, in Asian countries, the Martial Art is a part of their heritage and culture, and is shared openly on a basic level, but those that pursue it to mastery might be less than non-Asian countries. In many Asian countries, service on the police force, or in the military is mandatory for all adult males, and the Martial Art is part of that training In many other countries, hand-to-hand combat in the military serves as an introduction to Martial Art, but again, it does not necessarily lead to a serious study, or mastery of the art.
No there is not country, but 4 countrys are famous with this sport and the variants:
France has a sport SABETE is like kickboxing but is most for street fights.
Kempo in China very deadly.
Shadow Boxing in UK.
Mu tai Tailand.
All this Martial Arts are like kickboxing, but most deadly. I dont know if are masters in USA of this arts.
Thai boxing
according to wikipedia its either basketball or boxing but i reckon its table tennis
Boxing is an individual sport.
Vanuatu is the only country in Oceania that calls soccer it's national sport
The most popular sport in armenia is split between football and boxing, although Chess is the most popular 'sport' there but it depends whether you count chess as a sport?
Australia...
boxing
Hockey Quebec doesn't have a national sport, mainly because its not a country. P.S it is a province in Canada which has a national sport of Lacrosse not hockey.
Taekwondo is considered a form of karate and is the national sport of South Korea.
In the United States, baseball is known as a national pastime and is the national sport of the country.
Chess boxing is an unusual sport because chess & boxing are totally different 'sports'. Chess is a 'sport' of the mind, and is very calm (except when you or your opponent, whichever loses, is a bad loser!). Boxing is a 'sport' of strength, and is deffinately NOT a calm 'sport'.
Boxing