Is it true that the Gibraltar Strait used to be territory belonging to the British Empire?

True

Explanation:

Gibraltar was 'the only British colony which was part of the mainland of Europe; it was a tiny peninsula on the southern tip of Spain.

Gibraltar has remained under British control ever since, in spite of various attempts to take it back, including an unsuccessful siege by Spain that lasted for nearly four years until 1783.

one of the negative side effects were the economic losses the events of september 11th caused. many, many people lost their jobs as a result of a downturn in the economy after the terrorist attacks.