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In page Political development in modern Gibraltar:

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As a response to the 1967 sovereignty referendum, the British Government moved to increase democracy in Gibraltar with a new constitution.[1] Some in Gibraltar pushed for even closer integration, pressing for Gibraltar to be formally integrated with the United Kingdom.[2] However, the British Government declined that option, seeking to avoid "innovations which might make the development of a more favourable Spanish attitude to Gibraltar less likely".[2] There was also opposition in Gibraltar as full integration would have resulted in a reduced role for the Government of Gibraltar.[3]