The document provides support material for Class X Social Science, prepared by Kendriya Vidyalaya Sangathan, highlighting key historical concepts, including nationalism in Europe and the Vietnamese nationalist movement against colonial rule. It emphasizes the rise of nationalism, significant historical events such as the unifications of Germany and Italy, and the influence of colonialism in Indo-China, specifically Vietnam. The material includes various assessment formats like multiple-choice questions and short answers to facilitate students' understanding of the topics.