In 1898 Great Britain added to its colony at Hong Kong a 368-square-mile expanse of mountainous countryside and islands, leased from China for a term of 99 years, which became known as the New Territories. The colonial official, James Stewart Lockhart, after an inspection of the newly acquired extension, called it "the great difference". He was describing the gulf between the people of the New Territories and their counterparts in the existing, largely...