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<u>D. Industrialized Factories</u>
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Explanation:
Answer: Improvements in agriculture.
Explanation:
Pork barrel is unnecessary, a project of congressman for their own districts. It is the politicians - senators and their constituents benefited the pork barrel. They include unconnected expenses into bills which are then passed at a higher cost to the people. These projects help them support their voter by feeding money from other projects back into their own district.
The answer is D. <span> invention of the first steel tools
Actually, this very topic is still a hot debate among scientists because the shift happens on different reasons in each region of the world.
But one thing they have in common is that Steel tools give the member of early societies the capabilities to rake uplands and cutting up crops that really useful in farming and herding.</span>
A) Thirty years war
he Thirty Years' War was a war fought primarily in Central Europe. One of the most destructive conflicts in human history, it resulted in eight million fatalities not only from military engagements but also from violence, famine, and plague. Casualties were overwhelmingly and disproportionately inhabitants of the Holy Roman Empire, most of the rest being battle deaths from various foreign armies.