Because the people who live there overwhelmingly (98%–99%) vote in favour of remaining British. https://en.wikipedia.org/wiki/1967_Gibraltar_sovereignty_refere

Because the people who live there overwhelmingly (98%–99%) vote in favour of remaining British. https://en.wikipedia.org/wiki/1967_Gibraltar_sovereignty_referendum https://en.wikipedia.org/wiki/1967_Gibraltar_sovereignty_ref... https://en.wikipedia.org/wiki/2002_Gibraltar_sovereignty_referendum https://en.wikipedia.org/wiki/2002_Gibraltar_sovereignty_ref...