This article reports a study on the China-Canada-United States English Immersion (CCUEI) Moral Education and Social Studies (MESS) curriculum materials for elementary classes (Grades 3-6) with the aim of learning how the curriculum addressed the dual goals of MESS content and English language learning. An analysis comparing the CCUEI third grade MESS textbook with an equivalent level Chinese textbook demonstrates how China's national standards in MESS and English education can be met, and drawbacks encountered in the process. The CCUEI textbook was found to embrace grade level MESS content standards, but showed a varied degree of depth of content across standards. The textbook addressed all of the general goals of Level One English language learning (Grades 3-4) and most of the language skills indicators (16 out of 20). An additional in-depth teacher survey provided a user's perspective on MESS materials. The teachers rated the textbook highly for its activity-centered format and knowledge-rich content. They emphasized the importance of teaching English language as preparation for the MESS content teaching, and asked for more systematic support in language teaching from curriculum materials.