The new network extended as far as the islands of Sumatra, Java and Sri Lanka. The area located among these land and islands became the commercial and economic base for Srivijaya as a maritime state. The early coastal states continued to grow physically and spread inland, where they met up with more diverse cultures, which had already been through their own process of historical and cultural development. Their radiating power extended throughout the hinterland of Chao Phraya basin. There is evidence that the “Empire of the South Sea” had conquered the mainland once. Tambralinga invaded Lavo or Kingdom of Dvaravati in 903. References to the kings of Haribhunjaya, King Bakaraj (Drabaka), King Ujajitachakravard, and Javaka Raja of Tambralinga, were mentioned in these records. According to the Song's chronicle describes that San-Fo-Shih sent tribute to Chinese court by the command of King Che-Li-Wu-Ye in 961. The envoy reported the name of their kingdom was Xian-Lo-Gua. The import of new techniques and the growth of the initial Thai state affected agricultural production. The water buffaloes were introduced as beasts of burden instead of the oxen. This method was ideally suited for wet rice farming. Rice production increased and became an economic base for the development of the community. The people were able to develop their own economic system based on rice until they gained economic and political power over all others states in this region. Although the international trade through the Strait of Malacca had been favoured since the 6th century, the overland routes from the coastal towns in Southern Myanmar to the port towns of central Thailand were favoured until the early Rattanakosin period. Together with the rice commerce, Sukhothai, Ayudhya and Rattanakosin became one of the trans-peninsula routes parallel with the Strait of Malacca. The result of population movements and migrations certainly affected cultural traditions and lifestyles found among the peoples who are to populate the kingdom of Thailand. Therefore, the Thai / Sama / Sayam / Siam is the various indigenous peoples, Proto Malayu, Mon, Khmer, Champa, as well as to immigrants from India. In addition, the population also consisted of coastal peoples, some mariners, Chinese, and a host of other minority groups. This important characteristic is “The great variety” of Thai people.