Here's why:
* Historical Influence: London was the birthplace of the English language and its culture, and its influence spread across the globe through colonization.
* Global Finance and Trade: London has long been a major center for global finance and trade, which has furthered its connections with English-speaking countries and cultures.
* Cultural Significance: London is a hub for art, theater, music, and education, all of which have contributed to its prominence in the English-speaking world.
However, other cities like Sydney, Toronto, Melbourne, and Hong Kong are also important centers for English-speaking populations and have a significant impact on global culture. The ranking would depend on the specific criteria used for evaluation.
Ultimately, the importance of a city is subjective and can be debated.