Answer:
Trade, war, cultural spread
Explanation:
Water=boats=go anywhere faster than on land
hide evidence because it could lead to something crucial
They could have come up with a paid labor system as well as invest in mechanical that would have revolutionized agriculture.
Breaking down the money that was used to buy slaves, and finance their travel,food and accommodation, one have enough money to pay labor, even though minimum wage for some several years. The problem have to do with the notion of supremacy and savageness that characterized the whole of humanity in that era.
Pretty hard considering it was manual labor
Answer: The first one is the correct answer.
I hope this helps :D
