Could Gibraltar fall to Spain?

GIBRALTAR, GIBRALTAR - SEPTEMBER 11: People cross the frontier from Spain into Gibraltar viewed from Spain on September 11, 2018 in Gibraltar, Gibraltar.

As the date for the United Kingdom's departure from the European Union approaches, the effects of Brexit on the self-governing 6.8 square-kilometre enclave, whose 34,000 residents voted 96 percent to remain and is already outside the EU customs union, remains still unclear.

A British territory for 300 years, which has a land border with Spain, has a $2.9 billion services economy which heavily relies on frontier workers coming from Spain for about 50 percent of its labour force.

(Photo by Matt Cardy/Getty Images) ...