This research aims to compare the social studies curricula of Thailand and New York State, USA, analyze their similarities and differences, and propose guidelines for improving the Thai social studies curriculum. The study employed a qualitative research methodology, using documentary analysis of the Thai Basic Education Core Curriculum B.E. 2551 (Revised B.E. 2560) in the social studies, religion, and culture learning area, and the New York State K-12 Social Studies Framework. The findings revealed that the social studies curricula of Thailand and New York State differ in many aspects, including their fundamental philosophies, goals for student development, curriculum structures, learning content, and instructional approaches. The Thai curriculum emphasizes cultivating morally good citizens with a love for the nation, while the New York curriculum focuses on developing knowledgeable, skilled citizens who actively participate in a democratic society. In today's rapidly changing world, the development of Thailand's social studies curriculum should foster 21st-century skills, digital citizenship, and a sense of global citizenship among learners while maintaining Thai identity and values. Policy-level recommendations include creating a new vision, designing a flexible curriculum, developing online platforms, and integrating artificial intelligence. At the practical level, suggestions include creating community learning innovations, using the city as a classroom, developing a competency-based curriculum, and building learning communities with local partners.