Unity of Nation

The preamble declares India to be a sovereign, socialist, secular, democratic republic. It is declared that the Constitution has been "given by the people to themselves", thereby affirming the republican character of the polity and sovereignty of the people. The democratic character of the Indian polity is illustrated by the provisions conferring, on the adult citizens, the right to vote, and by the provisions for elected representatives and responsibility of the executive to the Legislature.

  The socialist character of the Indian Constitution is also emphasised in the Preamble, which spells out the inspiration of the people to secure to all citizens, social, economic and political justice. The Preamble also affirms a determination to secure liberty of thought, expression, belief, faith and worship and equality of status and opportunity, and to promote amongst the people a feeling of fraternity, ensuring the dignity of the individual and the unity of the Nation. Being a sovereign State, India is free from any type of external control. It can acquire foreign territory and, if necessary, cede a part of the territory in favour of a foreign State, subject to certain constitutional requirements;

Maganbhai Ishwarbhai Patel  v. Union of India, (1970) 3 SCC 400.