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I believe It’s is false! Hope this helps
Pros are that it’s a very self sufficient system of growing, made land management easier, it allowed for simplistic chain of command.
Cons are that it was easy to abuse the power given, the kings could raise taxes whenever they wanted, and you couldn’t marry someone from another social ranking
Marco Polo traveled during the middle ages (AP period 3), for this the communication technology was not very advanced and Western Europe didn't really know the situation of East Asia and vice versa. When Marco Polo explained his travels to the Europeans of the greatness of China many Europeans decided to go and see for themselves if this greatness was indeed true. When the Europeans arrived in China they were very impressed and a new promotion of travel to China emerged, INCREASING China's economy.
With the salve trade, the Europeans made some of the stronger African tribes along the coast heavily dependent on them. That was largely due to the profit and weapons that these tribes were getting from selling slaves to the Europeans.
The slave trade and the slavery though got abolished, thus the profit and weapons that the Africans were getting stopped. That resulted in the weakening, and after several incidents with the Europeans, the Europeans attacked them one by one and managed to conquer and colonize them easily.