Step 1: Understanding the Concept:
Originally, the Indian Union was comprised of four categories of states (Part A, B, C, and D). Reorganization became necessary on a linguistic basis.
Step 2: Detailed Explanation:
The 7th Amendment Act, 1956, implemented the recommendations of the Fazal Ali Commission (States Reorganisation Commission). It abolished the existing classification and created 14 States and 6 Union Territories.
Step 3: Final Answer:
The 7th Amendment ended the Parts A, B, and C categorization.