The Quaid-i-Azam and his sister Fatima Jinnah flew from New Delhi to Karachi on August 7, 1947. The Constituent Assembly of Pakistan elected Jinnah as its president at its inaugural session on August 11, 1947. In his presidential address to the Assembly, the Quaid said that the first duty of a government was to maintain law and order so that the life, property and religious beliefs of its subjects are fully protected. If Pakistanis wanted to make their country happy and prosperous they should "wholly and solely concentrate on the well being of the people, and especially of the masses and the poor." In that historical address he remarked further:

"You are free; you are free to go to your temples, you are free to go to your mosques or any other place of worship in this State of Pakistan…You may belong to any religion or caste or creed -- that has nothing to do with the business of the State…We are starting in the days when there is no discrimination between one caste or creed or another. We are starting with this fundamental principle that we are all citizens and equal citizens of one State.…My guiding principle will be justice and complete impartiality, and I am sure that with your support and co-operation, I can look forward to Pakistan becoming one of the greatest Nations of the world."

On the afternoon of August 13, Lord and Lady Mountbatten flew from Delhi to Karachi. The state procession on August 14 was staged in open cars with Jinnah and Mountbatten in the leading car and Miss Fatima Jinnah and Lady Mountbattten in the next car. Mountbatten addressed the Constituent Assembly of Pakistan followed by Jinnah.

Pakistan became constitutionally independent at midnight between the 14th and 15th August 1947. The Quaid assumed charge as Governor General on August 15 and the Cabinet of Pakistan, with Liaquat Ali Khan as Prime Minister, was sworn in on the same day.