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Among the earliest inventions were the abacus, the sundial, and the Kongming lantern. The Four Great Inventions,the compass, gunpowder, papermaking, and printing – were among the most important technological advances, only known to Europe by the end of the Middle Ages 1000 years later.
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how am I suppose to know what your not talking about when you didn't even put a image in image of what ?
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so that they can have an test flight and help make there invetion better
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Affordable Property
Explanation:
It was caused primarily by the poor economic conditions as well as the prevalent racial segregation and discrimination in the Southern states where Jim Crow laws were upheld. According to Isabel Wilkerson, the migrants and the children of the migration put the lie to the limiting ideology of Jim Crow, and exclusion.
This might help as well:
The driving force behind the mass movement was to escape racial violence, pursue economic and educational opportunities, and obtain freedom from the oppression of Jim Crow. The Great Migration is often broken into two phases, coinciding with the participation and effects of the United States in both World Wars.
