Why some Thai nationalism and some ignorant foreigners try to ignore the reality that happened in the territory which belonged to ancient Khmer empire? One big part of present Thailand was Khmer land in the past. It is not influenced by Khmer. Why it is said to be influenced by Khmer. It's real Khmer. How many ancient monuments leaft by Khmer. Who built that great monument. NOT Thai, related culture, if you are difficult categorize which is Thai and which Khmer, Let compare the style of both nation in the building. Two things for comparing is some style symilar to Angkor Wat style and Temples in Ayuthya style.
Must say that, related to territory, the former ancient Khmer territory rather than saying the territory influenced by Khmer.