Is "Muay Thai" the first in the kung fu world?

Muay Thai dominated boxing for nearly a hundred years in the last century. Japanese karate, American boxing and China martial arts have all been defeated several times, severely disabled or killed. Later, China, the United States and Japan formed a United front and were beaten back. As a result, Japan has also produced a kind of martial arts specially used to restrain Muay Thai (but it doesn't seem to be of much use), so Muay Thai is called the first martial art in actual combat! Attention is fighting! Of course, in recent years 10, countries have been able to compete with Muay Thai, but Muay Thai should be the most effective because of its own boxing characteristics and professional league in China! So I remember that about 4.5 years ago, the armed police in China invited Thai boxers to teach Muay Thai!