How were Venice constantinople and canton in the 1400s similar?

In the 1400s, Venice, Constantinople, and Canton were all significant trade hubs that facilitated the exchange of goods, culture, and ideas between the East and West. Venice served as a critical gateway for trade between Europe and Asia, while Constantinople, as the capital of the Byzantine Empire, was strategically positioned along trade routes connecting Europe and Asia. Canton, on the southern coast of China, emerged as a vital port for European traders seeking access to Chinese goods. All three cities thrived on their strategic locations and played pivotal roles in the global trade networks of the time.