Domesticated animals.
The nomads :)
The main event that led the United State to take a more active role in the world affairs was World War II, since the US emerged from this war an economic superpower. It was also clear that some nation needed to "fill the void" left by the relative fall of the British Empire.
During the period of the Renaissance, Italy was divided into numerous small city-states controlled by local wealthy people. There were large differences though from one city-state to another, and while the northern ones were very wealthy and had things going very smoothly, the southern ones were much less successful.
The reason why the northern Italian city-states were so wealthy was mostly the trade. These city-states had excellent large ports. They were producing multiple things that were in high demand and also very well paid for for export, and were getting lot of things they needed and desired from the other parts of the world.
These states had very well developed fleets, and they were trading with multiple Asian regions, Europe, as well as parts of Africa. They were exporting their high quality products. Very often they were buying certain things from one place, then re-sell it in other place buy much higher prices, thus getting more and more wealth over time. That wealth enabled them to get all they needed without any problem, thus making them very stable and strong small states.
The technological progress in all civilizations before the scientific revolution was made by scientists who were influenced by Greek science.
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When was the Scientific Revolution begin?</h3>
Scientific Revolution was the era that began in the year 1500 and lasted till the year 1700.
Prior to the introduction of the Scientific Revolution, advancements in technology were made in accordance with Greek Science. The scientific method was firstly developed by Aristotle in the ancient era of the Greek period by his empirical and logical knowledge.
Therefore, the explanation provided in option A is the right answer.
Learn more about the Scientific Revolution in the related link:
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Answer: The Revolution's most important long-term economic consequence was the end of mercantilism. ... The Revolution opened new markets and new trade relationships. The Americans' victory also opened the western territories for invasion and settlement, which created new domestic markets.
Explanation: