Explanation

Pakistan became an "Islamic Republic" in its 1956 constitution.

This constitution was the first to declare Pakistan as an Islamic Republic, reflecting the country's identity as a democratic state founded on the principles of Islam.

**Additional Info**

The constitution was adopted on March 23, 1956.

The 1956 Constitution was abrogated in 1958

when President Iskander Mirza imposed martial law and declared himself the Chief Martial Law Administrator