Arrange the following statements in chronological order.
1) Jawaharlal Nehru decided to merge Hyderabad state with the Union of India.
2) Hyderabad emerged as a democratic state under the leadership of Chief Minister Dr. Burgula Ramakrishna Rao.
3) Coastal Andhra and Rayalaseema regions were carved out of Madras Presidency to form the state of Andhra.
4) The leaders of our nation enacted the States Reorganisation Act.