Article 1 in the Constitution states that India, that is Bharat, shall be a Union of States. The territory of India shall consist of: The territories of the states, The Union territories and Any territory that may be acquired.

Article 2 states that the parliament may, by law, admit new states into Union of India or establish new states on terms and conditions it deems fit. For eg. the addition of the State of Sikkim by the 35th (1974) and 36th (1975) constitutional amendments.

Article 11: Parliament to regulate the right of citizenship by law 

Article 22: Protection against arrest and detention in certain cases