The key difference is that Dutch kickboxing allows fighters to kick both above and below the waist, while American kickboxing only allows kicking above the waist, so no low kicks are allowed. As such, the Dutch style allows more ways to attack their opponent than the American style.
Russia is statistically the best wrestling country in the world, having won the most gold medals across different styles of wrestling in both the Olympics and the World Wrestling Championships, the top two most prestigious wrestling competitions.