Answer:
Europe
Explanation:
Europe as a continent has the highest concentration of trade. Europe comprises of almost more than 50 countries in itself. Right from early days, trade prospered in Europe and Atlantic Ocean, which stretches between Europe and America, remains the busiest ocean owing to this fact.
During times of colonization, spices and indigo were imported to Europe as the continent was one of it's highest consumers.
With the advent of European Union, trade further strengthened as a common currency in the form of Euro was established. This eased out the process of trade.
