2. Eastern Hemisphere societies developed long distance trade more extensively than Western Hemisphere societies because of geography. Some geographical differences added obstacles. For example the narrow bottleneck of Panama covered with dense rain forest that made almost impossible the connection between North and South America. In the Eastern Hemisphere had similar environments in all the routes which made the development more rapidly. Also the help of animals to carry some goods helped the spread in trade more efficient in Eastern Hemisphere societies. Domestic animals like horses, donkeys, and camels, or wheel vehicles and large oceangoing vessels facilitated Eastern Hemisphere trade. In the Western Hemisphere there were no animal like that so humans had to carry all weight, and this made very inefficient the Western Hemisphere trade.
3. Commerce