I did a little research.
There are no ssd manufacturers based in Thailand. About 50% of all ssd manufacturers are based in the United States. Asia is well represented with China, Japan, Korea, and Taiwan. The remaining companies are located in Europe.
What I don't know is where actual factories are located. Just because a manufacturer is located in the USA does not mean that the ssd's are actually made in the USA. For example, OCZ corporate headquarters are in the USA but the company maintains satellite offices in The Netherlands, Canada, Brazil as well as manufacturing and logistics facilities in Taiwan.