Answer:
By craftily promoting as a "neutral zone" between countries, Siam created schools, ended slavery, reformed its legal system, and improved transportation in order to remain an independent, modern country.
Step-by-step explanation:
By promoting neutral zone, Siamese kings do not have to face pressure from the conflicting countries around them. Since siam did not help any side during the conflict, the other countries that involved do not have any reason to attack Siam. Because of this policy Siam remained independent and free from the influence of other countries. They can focus all of their national income to build their infrastructure.