The answer is "A" Vasco de Gama discovered a new route to india around the tip of Africa.
A. Astronomers predicted eclipses and developed a 365-day calendar.
(CORRECT)
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B. The city of Machu Picchu was probably a retreat for nobility.
(INCORRECT)
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C. Scribes painted books and kept records of taxes and territories conquered.
(INCORRECT)
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D. Emperors communicated using runners from the capital city of Cuzco.
(CORRECT)
Answer: 1) While it was true that the cotton gin reduced the labor of removing seeds, it did not reduce the need for slaves to grow and pick the cotton. Cotton growing became so profitable for the planters that it greatly increased their demand for both land and slave labor. 2) The Underground Railroad was a network of secret routes and safe houses established in the United States during the early to mid-19th century, and used by enslaved African-Americans to primarily escape into free states and Canada. 3) All of these men involved themselves in the abolitionist movement by speaking out. They all were against slavery and one in particular, Frederic Douglas, wrote many books after being freed from slavery. He was also invited to go on tour and make speeches about antislavery.
It supported the national government's sovereignty over matters of foreign policy and interstate commerce.
The lure of the land, the desire for wealth, the search for adventure and a new start, and religious reasons.