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450 AD - 1400 AD
the creation of cannons increased are military and increased pressure on other countries.

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700 BC - 450 AD
Iron farming equipment and weapons. Military dominance, the iron blade plow increased food production.

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2,300 - 700 BC
Copper and tin to produce Bronze. With bronze being invented it led up to bronze jewelry and tools. The use of bronze replaced stone tools, allowed humans to alter there life.

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4,000 - 2,300 BC
The stone plows helped with farming and it was dependable all year round food supply. And it started the division of labor.

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10,000 - 4,000 BC
The fishing tackle was a big improvement from what they had before. It led to the domestication of animals and agriculture led to settled communities.

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500,000 - 10,000 BC
The Stone axes were important at this time because  It Improved peoples diets, and when it improved peoples diets It led up to the increase in population .