- The Union of India consists of States and Union Territories according to the Constitution. - Originally, States were categorized as Part A, B, C, and D but were later placed on equal footing. - Parliament has powers to admit new States, alter State boundaries, and acquire new territories for the Union. - In the Berubari case, the Supreme Court ruled that ceding part of West Bengal to Pakistan as part of a border agreement required parliamentary approval since it involved altering State territory.