Indian Politics
Sikkim was made the full fledged state of Union of India by

The 39th constitutional Amendment Act (1975)
The 38th constitutional Amendment Act (1975)
The 36th constitutional Amendment Act (1975)
The 37th constitutional Amendment Act (1975)

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Indian Politics
The Parliament of India cannot be regarded as a sovereign body because

it has to operate within the limits prescribed by the Constitution
the Supreme Court can declare laws passed by parliament as unconstitutional if they contravene the provisions of the Constitution
All of these
it can legislate only on subjects entrusted to the Centre by the Constitution

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